Are you shooting video or photos or both?
If it's for video, there are a lot of cameras you can get but even for a $1k price, you can be limited especially when you need various lenses. I will say though, you don't need much since most just want something for online content (the 5 min recap on Youtube/Vimeo) but if you want something a little more tech proof, get a camera that shoots 4K since most TVs are in 4K now. Also know that if you are doing video, you need the computer for it to process all these large files. I know handful of people that do this and it's hard to do things for a budget. The good thing though is you can get your money back fast if you shoot a lot of weddings. The prices you can ask for can be pretty high if you have a good portfolio.