Do you have one light working?
80W at 12V is about 7 Amps (80W / 12V = 6.67A). A fully-charged car battery is about 14.4V (which means a little more current) and there is extra "inrush current when an incandescent lamp first turns-on. ...So, make sure your MOSFET is appropriately current-rated, and it may need a heatsink. (If it gets too hot to touch with your finger that's an indication that you probably need a heatsink.)
I've seen code and videos on youtube
I dont' know what you're finding on YouTube but here is a MOSFET driver circuit (for one light/channel) if you need another reference. You can leave out the diode since you have a non-inductive load.
but they all show only 1 MOSFET connected to a 1 light. How do I connect all 10 MOSFETS to the Arduino and be able to control all 10 lights?
For testing & development purposes, I'd suggest using 10 "regular-little" LEDs with the usual current limiting resistors. (No driver circuit is required for those.)