Just my .02, but at your level chessbase is not necessary. But if you still want to shell out the money for it? Start with the basic package.
ChessBase software

I just started getting lessons today to work on improving my rating and my coach suggested getting some version of it so we can use it for some of her pre-made lessons. It looks like I can get older versions that work well enough, but which one to buy?
I'm looking to get ChessBase for the first time. Any tips on which version to buy and the best value? Also, where is the best source to get it?