#1 Purchase a finger board. If you are just starting, Tech Deck is a good way to go, but Girl and Zoo York are also good brands.
#2 Master the ollie. The ollie is the basic trick in fingerboarding. Place your middle finger on the tail of the board and your index finger in the middle. Some people like it closer to the nose of the board because it gives you more control. Press our middle finger down, forcing the front of the board up. Move your finger forward slightly, making the back of the board come up, too. This will not work if you do not do it quickly. Press down, but not forcefully, so that the board lands on the surface your skating on, and your fingers land on the board.
#3 Learn the 50-50. The 50-50 is the basic grind for skateboarding, fingerboarding and handboarding. Ride straight at the beginning at the rail or the edge of the box. Ollie at the rail or edge. Land your trucks on the rail or edge and slide along until you reach the end. Ride off and land it.
While sweeping your mid fingers, slide your index finger a little forward. This will make the board flip. Land it by practicing the trick a lot. Also put it in the Ollie position.
This is probably the first flip trick you will do. To start off, kick it up right where it start to dip in and kick out and catch it with your two fingers. So you put your back finger on the tail and your other just in the middle and slide it to the back of your board and do it until you get it right.