I comish 4 leagues, and the only way anyone can give you accurate advice is to know your scoring system.
Roto, points, H2H, etc. All scoring systems are different and provide different strategies for sure...
If you are playing in an established league with established members, it will be tough being the new guy if you have zero experience. There are so many ins and outs to fantasy baseball. Go into the year as strictly a learning year and you should be able to enjoy it. Pay attention to what others do and why they do it.
Fantasy baseball is a blast, but you really have to be willing to put some time in to have success. You MUST check into your team daily to see what is going on with waivers, drops, trades, etc. If you plan to check in every few days, you are already sunk.
I too did fantasy football for years and years, but when my interest in the NFL took a dive a few years ago, so did my interest in fantasy football. Dropped out and haven't missed it at all.
There is no way I could ever stop fantasy baseball though, just absolutely freaking love it! I probably spend an hour a day on my teams, or more, without fail.