Scratch

Let me frank; I have this really cool idea for a game. I want the character to have the fallowing abilities, and incorporating velocity, gravity, and scrolling in both the Y and X axes. Please help me, and I'll put your username in the credits. I know this is a tall order, but I would really love it if you helped. And please don't say that this is too much to handle for a newcomer. I'm sorta new, but I know how a lot of the things work, so most stuff wont go over my head. Please, help me. Here is a list of what I want.

The player can move left and right.
The player can jump, and fall back down.
The player can change his direction in mid jump.
The player can do the above but faster (as if running) when another key is pressed.
The player can jump, and then jump again in mid air, and then fall back down.
The player can do the above, but instead of falling back down regularly, he glide down slowly when another key is pressed.
The player can jump, land on a wall, and slowly slide down the wall.
the player can do the above, but then jump off of the wall.