I always start by filing, buffing and putting a clear base coat on.
These are the dotting tools I use. They're just two mechanical pencils I don't use and I put a nail through the eraser. The head actually makes a pretty big dot, so I made the other to do more detailed work. Plus they're great because they're big enough and long enough that I can use them with my left hand too!
Have fun with it! And remember that not all ideas work out and there's usually a leaning curve - especially with tape. I often put the tape on too soon so the first color gets messed up or I didn't press hard enough so the edges aren't clean. The best lesson to learn is to not be a perfectionist with this - play! get dirty!
If you don't to take the time to do all your fingers, just pick one. I'd suggest picking contrasting colors, this way that finger will really pop.