Can some one halp me with the scripting with my game?

I am making a speed run game and have a way to make levels that work, but I need a script and a a GUI to tie it all together. I have no idea where to start, can some one run me through the steps of making them? The biggest problem is that I know little to nothing about scripting.

I am not asking for you to make the script, I am asking for you teach and guide me through making it.

The script I am trying to make needs to to:

1. Teleport them to the next level when they reach the end of the current one.

2. Remember what levels each players have beaten.

3. Remember how long the player took to beat each level.

4. An auto save feature, preferably that saves the player's progress when they beat the level.

The GUI I am trying to make needs to:

1. Allows players to teleport to levels they have beat.

2. Allows players to teleport to the next unbeaten level (for example, if a player has beaten level 2, the GUI would allow them to teleport to level 3 so they could complete it).

3. Display the amount of deaths and fastest time taken to beat a level.

4. A reset progress button.