Tons! Ok first of all, welcome to the chapter we're kind of the best
Not, you know, competitively, but in awesomeness for sure
A libby is a good place to start, I suggest throwing on a jump pack and divination. The battleforce is a pretty good valued buy, giving you (essentially) a 10 man assault squad (RAS) and a 10 man tactical squad (Tac.) with a Rhino. It also gives you the special weapons you will be using for your jumpers, so that's a plus. If you're trying to use the battleforce to save money you can definitely make decent lists, here's a few tips on that.
First of all, get razorback turrets on ebay (or if you have any lying around that's fine too). The rhino is great and all, but mobil fire-power is where BA excel (well, that any black-armored maniacs with chainswords!!) so...
One idea is to use the Tac. squad as is (use the ML and one special weapon for them, then another for the jumpers) and then combine the DC and RAS into one 10 man squad. That's what I did, and it's worked out great - gives me some nice RAS models that don't look overly crazy. If you want to play DC, however, you could go the opposite way: Theoretically, you could combine bits to get 10 jumpers and also 10 bolter DC (which is preferred if walking, btw). Another idea is to use the sets as they are and throw the RAS in a razorback, saving the packs for later kits.
Battleforce aside, RAS are the core of BA armies. I generally take a libby with JP along with 30 RAS with varying gear (I'll talk about that below) and a priest equipped with a Power Sword and a JP. After that, anything mobile and shooty is good; Razorbacks are decent, Baal Predators are great, MM attack bikes are great, Stormravens are fantastic, Vindicators are fantastic, Landspeeders can get good... You get the idea. Fast and shooty. A wall of av13 is also tons of fun to watch an enemy deal with... The things don't really die.
So, RAS gear. The old standard used to be 2x meltas and a PF, and I still love that; however, it only goes so far, as vehicles are taken much less often than they used to be. My current favourite load out (suggested by
) is 2 flamers and 2 hand flamers: For 220 points you get 10 guys with 29 attacks on the charge and 19 the rest of the time along with 4 flamers templates. Sure, two of them are only s3, but they really add up.
I hope this has been helpful, if you have any specific questions make sure to let me know (either here or through PM)