Made a guitar and the string hight is massive! PLEASE HELP!?

Idk about electronics or any of that, but it doesn't have alot to do with your action. You probably need to adjust your truss rod and/or lower the saddles. the Gauges of the strings will affect your action and your truss. Its all about counter-balancing string tension. If you have a bridge that's set up for trem you will need to adjust the springs in the cavity, especially if its floating. You will need some tools for this, and knowledge, and you might as well take it to a pro if you don't know what you're doing. Focus on finishing it and getting the cosmetics, electronics, feel, etc. exactly how you want them before you start messing around with the setup.