Hi,
Not a problem! I've made a screencast below that shows how to project your sketch to a surface, in your case the cylinder face. This is a pretty handy tool that I think works really well.
http://autode.sk/1UlQQJf
In your case though, there may be an easier option to create holes in your cylinder body. In my screencast you'll notice that I created an offset construction plane. What you might wanna do is create the circle in that sketch and then extrude it through the cylinder using the "Cut" option in the "Extrude" command. Attached is a screenshot showing what I mean.

Hopefully this clears up some confusion! Let me know if you have any more questions.
James
James Youmatz
Product Insights Specialist for Fusion 360, Simulation, Generative Design