Van life

So I really want to get out and live off the environment sorta and just go in a van with my pup to wherever just to experience something new and refreshing. I want something warm so I don’t have to worry about being too cold but I’m unsure of where I should do that. I also want something a little more low cost but just as fun. I plan on budgeting before the trip and setting aside the money in envelops so i never have a day I can’t do it and start rethinking things though. I was just wondering if anyone had suggestions on some areas though this will be maybe a 3-4 month long trip of just living out of my van with a dog taking what I need in advance for hygiene and first months snacking food. I just don’t really know enough in my opinion and would like something to go off of so I’m not having such a rough time adjusting when it should be fun or not really having the best time I could be having because I didn’t have enough information beforehand.