You're going to have to pick and choose when to go at Olimar. The short b***ard is a really bad matchup for Falcon (any short character is). Try dash dancing into a raptor boost, or air dodge over olimar, then raptor boost back towards him. Do everything you can to get him into the air. After that it's really just a matter of getting him off the stage. Olimar is by far and away one of the easiest characters in the game to gimp. He only has a tether recovery, so grab that ledge and he should lose a stock...lol. Also watch out for his grab game, it's really pretty stupid how good it is. He has a lot more range than you'd think. Falcon kick and raptor boost should work well, but don't abuse the raptor boost or you'll get *****. If you land a running A on him, go straight into an Up Tilt, and from there try to get off an Up air or Back air. So Running A>>Utilt>>Uair/Bair. Lastly, a hyphen up smash is nice for KO's if you can catch him off guard with the moves sliding distance.
That's all I have on this matchup, but also...if you only picked up Falcon yesterday, just remember: DON'T play him like you played him in melee. That'll set you up for a loss real fast.