I've been (Mostly) 24/7 going on 7 years now. I say mostly because there are certain times that I don't wear, more on that later. I'm more than happy to answer any specific questions.
If anything I think wearing 24/7 initially is more about learning. What works for me isn't going to necessarily work for you. A lot of that learning can seem basic like hygiene; where as dating not so much. There is a lot to be learned in understanding you body and your personal limitations.
Setting up a budget is the first thing:
Knowing your budget will allow you to better determine how you want to stock your diapers. I stock Abena m3's for my everyday wear. I also invested in several cloth diapers over the years for when I am home. I also keep a couple bags of economy diapers and inserts (or size seven baby diapers) on hand just in case of emergencies. I only keep a bag, at most, of ABDL diapers on hand. Mainly this is to reduce costs but also because I find them impractical for daily use. I absolutely love them for special occasions.
Always take supplies with you:
I have a couple bags that I use. A backpack for everyday use and a gym bag for when I need to be a bit more discrete. I tend to keep 3-4 changes in my day pack. This can make travel interesting, sometimes I pack enough for the trip (quick business trips) and sometimes I bring enough for the travel time and a couple of extra days and just end up sourcing locally (vacations or extended photography sessions)
Hygiene
The more you wear the more important it becomes. A diaper is a prime environment for bacteria. Research what you are up against and have a routine. Learn how to care for your skin, particularly in the diaper region.
Leaks happen:
Invest in some good plastic pants. I have a couple of elastic sets that are PUL and a couple of Velcro sets that are flannel lined PUL. I consider these the most important garments in my collection and I treat them as such. It will save you a lot of embarrassment and a lot of laundry. I find they also help reduce smells related to use.
Work and School:
It is one thing to wear 24/7, it is another to use 24/7. If you plan on using them as intended have a plan on how to handle changes at work/school. I don't mess at work or school, this is more of a moral thing for me but the bigger the clean up the more time it takes which isn't good for business. Plastic grocery bags are a great way to deal with smell. I keep several in my diaper bag.
Medical considerations:
The act of wearing a diaper increases the average temperature of the related body parts which can potentially lead to reproductive issues there are ways to mitigate this through nutrition, and time not spent in a diaper (despite the idea of being 24/7) daily. As well as possible skin related issues. (I'm not a doctor so don't take my word for it.)
Changing:
Have a routine and try to make sure you are dry before putting a new diaper on. I use both disposable wipes and cloth wipes. The disposable for a quick clean followed a dry cloth then powder. The longer those regions stay moist the higher chance you have of lingering smells and skin issues. Learn how to change in a bathroom stall. Also, know your diapers capabilities, because they own your schedule now.
Summer:
I find that in the summer I go through more diapers because of sweat. I also work outdoors so that doesn't help. Also, as I said before wearing a diaper increases your body temperature in the diaper area. I also mentioned sweating, staying hydrated in the summer can be slight more difficult.
Night time:
If you aren't used to sleeping in diapers it can be difficult to fall asleep at first and is a bit of an acquired habit.
Also, I don't need them when I am sleeping. That said, I wear a cloth at night with no cover for a little added air flow. I started with disposables at night but I found that I move a lot in my sleep and would basically render them useless by the morning. They fair better with my Velcro covers but a little bit of stretching still occurs resulting in morning leaks. I found that the quality of diaper helps but would still be in a questionable status in the morning. This is a great time to use diapers with multiple adjustment tabs if you intend to sleep in disposables. All in all it didn't make any financial sense to keep wasting one each night just for the sake of wearing. This is part of the (Mostly) header, there are some nights that I just don't wear.
Other random thoughts:
-Get clothes that are specifically fitted while wearing your diaper and cover if you go that route.
-Investing in onesies (or diaper suits depending on source) can help with sagging diapers, my Velcro diaper cover's are more than sufficient for this but I do have a few for when I am wearing the other ones.
-If you get cloth diapers, learn how to care for them. They can degrade quickly if they aren't cared for.
-If you don't have access to your own laundry machines (some apartment), cloth can be tiresome to deal with.
-I know that no of this touches on any of the relationship stuff and that is intentional. Out of habit through working in the addiction recovery field I avoid giving advice on them. Just know relationships can be made more difficult by diapers, need or not.
-If you plan to mess regularly learn to love yogurt, the probiotics can help reduce smell.
-Don't invest in the lifestyle all at once.
-Don't feel like you have to wear all of the time. Sometimes there are situations in life where it is better not to wear. (For example, I am a swimmer but I choose not to wear swim diapers and opt for using the restroom.)
Anyways, I hope this is a good starting point. Like I said earlier if you have any specific questions feel free to ask.