If you want your betta to lead an awesome life, here is what you need.......
2.5 gallon tank..... if you don't have room a 1 gallon would be sufficient, but the bigger the better.
silk plants
sand/gravel
different kinds of food (pellets, bloodworms, shelled peas)
water dechloinator
and most importantly give him lots of love and attention. To get a delta you will probably have to order him, I suggest looking aroudn aquabid, although I recently found a delta at my lfs, it isn't very common, at least not where I live..... That's all I can think of for now, but I'm sure others will have much more to add. Have fun, and beware, the world of bettas is highly addicting!!!