index futures or CFDs ?

Newbie, sorry for basic level. I want to make profits based on the daily movements of stock indices, specifically FTSE100, but I don’t know how to go about this. My plan is to make a daily decision on whether the Index will go up or down, with an estimated (= hoped for) 55% success in judging the direction. I have read about Index Futures, and CFD’s, but I don’t understand whether these are the same thing or different. Which should I think about using? And how would I go about using them? Is it possible to make profits net of dealing charges based on a 55% success rate?
Any advice would be appreciated!