I do it ..
I wildcamp most of the time but use a campsite about once a week to empty tanks, refill, laundry etc.
Lots have been written about where to park ... its mostly common sense, you will get the hang of it. Don't listen to the killjoys.
Just show respect ... pick up litter, even if its not yours, don't be an eyesore ...arrive late, leave early.
Power ... first get good leisure batteries .. I have 2x 125 amp elecsol carbon ones which are great.
One night on a site, plugged in will give the batteries enough charge for 4 days parked up and with the solar panel will be good for a week or more.
Solar is good ....get as big a panel as poss ... and a battery master to keep all the charging in order.
Other stuff ... led light bulbs, a sog bog, a wind up lantern ...all good.
Generators ... urghhh ! If you really have to I suppose they are
convenient ... but in 6 years of fulltiming I've never used one.
Lastly ... just do it ... ignore the "no you can't do that" crowd and have fun.
ps.. oh ...did i mention using old chip fat as fuel ?? maybe later !