Hi.
Do you know how to do front roll? It is a good start for flips.
To do front flip, take three-four medium pace steps, make a short jump (1ft is enough), land on the balls of both feet, raise both arms up, jump UP, and in the jump throw you hands down, tucking in. Untuck once your legs are rotating down.
If you land on your back in the front flip, you are not rotating enough. Just remember to jump up, rather than forward. Running up will give you enough forward momentum.
If you feel uncomfortable doing front flip from a run, learn to do flip from a raised stationary object such as a chair. 2ft is high enough to give you enough space for rotation. You can do this at home: take a spring matrass and throw some pillows underneath it to soften the fall. Or do it outside into snow. Just make sure the object you are jumping from is sturdy enough that it will not break or fly away when you jump from it.
Bye.