Licensing music to Youtubers- How to?

[edmondredd]

Here's a technical questions to those who are already doing that!
How do you license your tracks to youtubers?
Say for example, a prominent youtuber contacts you and ask for a music to be used on his channel. (Either for his intro on his weekly show', or even for one episode). How do you guys handle this? upfront fees? WFH? back end? Royalties? metatags? publishing splits? etc..
A quick search on the web returned many results on how to use music for your channel but not from a composer perspective.
Any tip would be highly welcomed! thanks a lot,