Planning can pay off, but it is easy for many of us to get overwhelmed by details and perfectionism.
What kind of camper?
2wd or 4wd?
How much solar and battery?
Which cargo van?
Here are some ideas to help break the cycle of endless research.
Have a minivan? A pickup? An Suv? A car? Start with that. Do the camping/living you like in that vehicle you already own. This will get you practical experience with the vehicle (and your own preferences) as soon as possible.
It doesn't take much:
Your early test runs will be easiest to do near your home base. Maybe in your driveway. That way if there is a problem or forgotten item (toilet paper!) you can run back in and get it.