oh ill will help you out. tekkenzaibatsu.com is the best place to learn tekken by a billionfold. never the less i will give you the basic info to research and up your roger play. i dont play him myself but this info will carry over to anyone you want to learn.
always start by compiling a top ten move list… most threads have this… your going to have to average it out and make sure people are talking about why they find the move useful. make sure there is at least one of these moves.
homing moves (indicated by a white trail or streak on the animation) to shut down sidesteps
(universal are better moves that track left and right sidesteps vs. one side only)
bound moves that will allow you to extend your combos to maximize your damage output. as well they carry your opponent further to the wall for combos
a fast safe launcher preferably a mid over a high.
as time marches on you can add another 10 moves, but for now keep it simple.
after you feel good about your moves you can move on to bnb combos… don’t waste your time with anything below 60 damage… (180 is the life bar)
Im not sure where your tekken knowledge level rest but the “level up your game” channel on youtube does a great job at teaching the basics to intermediate play.
if your picking this up on the PSN: UndeadEwok, if you want to learn more.