Every time we go camping, we come home with a list of things to buy. We actually make a written list. Then we do some researching, some discussing and decide what we REALLY need at the time as the necessities (the new tires, water pressure regulator, water filter, surge protector, jt strongarms, vent covers, better sewer connections and centipede, etc) came first. We are now at the point of getting "convenience" items instead of necessities, so for us, it's no rush to buy them. We also have a budget that we really try to abide by.
Last time we went camping, one of our friends went to her camper the first night of a 5 day trip and ordered 4 or 5 things we had discussed around the campfire and they were waiting at her front door step when she got home a few days later. DH and I have to plan a little more and in that planning and discussing and googling and budgeting time, some of the things we thought we wanted, we realized didn't really need or at least don't need NOW.
So just take your time. Investigate, research, talk to others, mind your budget and have fun!!
2015 Coachmen Chaparral 360 IBL
2014 Ram 3500 Turbo Diesel 6.7 4wd Crew Cab Dually