I'm not a pro by any means, but I can help by pointing you to some resources.
First, if you haven't already, check out
Myran's Olimar guide. It's a fantastic place to start learning about the general mindset for Olimar and he goes into a few techs that will prove useful if you decide to stick with the character.
Then, if you have time, definitely give the
Q&A and
competitive discussion threads a read. You won't necessarily find everything nice and organized, given to you on a silver platter, but you will absolutely get some good knowledge about matchups and advice.
The
video thread is a great place to watch high level play and even post your own recordings to get advice.
@
koken also put together a very nice
quicklinks thread in case you want easy access to some important info.
Since you're new to SmashBoards, (welcome, by the way!) I'll say that one of the best things to do is just look around the forums. Stickied threads are generally more important and more information will be posted in them, but if you keep an eye on other threads, sometimes you can find some cool ideas that people post. My biggest advice is just to learn to use the boards to your advantage. Look around to see if your question already has been answered. If not, ask specific questions. It's hard to just dump tech on you if we don't know what you're looking for or what skill level you're at already.
Good luck and enjoy playing Olimar! Have a good time on SmashBoards!