Welcome. Learning is all part of the fun. Sitting down watching others is funerer! Here's my 2c
Reversing: good advice given already. Over correction stuffs up a lot of newbies. If you find it all going wrong no harm in driving forward to get it all straight again. I find easy long distance reversing easier by looking over my shoulder through the back window, but tight technical reversing easier by using my mirrors. No idea why. I just do.
Essential Gadgets: fridge, cooker, some lights, a lighter and a stove top Espresso maker. The rest is fluff... ;p
Personally I don't care what others bring. If it works for them, great, but we go camping to get away from devices. My greatest pleasure in life is sending the group email that says I'm going camping, won't have email or phone access (even if I do)