If you are using fl studio there should be a "split tracks" option before you render the track. Check this:I like NHBeats answer!
Exclusive rights (in terms of dealing with Internet rappers) basically means you can't resell that beat to another artist or rapper. In other words, they're the only one who can use it. You may want to consider this but make sure if your selling you charge more for this privilege.
Also generally if your selling exclusive you'll give them the tracked out wavs, whereas if you're "leasing" you'll want to send them just a single mp3 or .wav file. If you have any more questions feel free to pm!