I would recommend jumping on COMC.com and doing some window shopping to find out what you like, you can see the cards that are up for sale and also the cards that have been sold just to get a visual on what you like. I jumped back into collecting a few years ago and I started with Cherry on a few group breaks but it can be very hit or miss. I've also used Mojobreak over in the US and you get all cards inc base sent to you which is good when you're starting out, it can trigger a set chase or even a PC player chase. Busting boxes can be expensive but its a good way to start as you can get some cheaper boxes and it doesn't matter if you don't hit huge but you will at least hit an auto or something. It's hard sometimes to get in group breaks for say a $50 spot and watch as you hit nothing, offset by the chance at paying $50 and getting some sweet mid-high autos.
Jump in small and work up as the cards will probably always be there if you wait