[joe231]

the issues with your headlights could be the headlight switch, the dimmer, the connector on the radiator core support, the lights themselves, or even a bad ground connection.....your dimmer switch is mounted on the floor to the left of your accelerator, brake, and clutch(if you have one)
there is 3 wires, with the headlights on check for power on the wires, you should have one wire that is a hot feed, and 2 wires that: one goes to the high beams and one goes to the low beams. if you have no power there then your headlight switch is suspect, if you have power there on 2 of the 3 wires then move on to the connector on the core support, sometimes you can wiggle the plug and get a better connection, if you have power there check the plugs on the headlights, if there is power making it to the lights but they still don't light up, you need to check the grounds and the lights themselves. you could also work backwards from the lights to the headlight switch.

you basically need to do the same for any circuit you are having problems with. the dome light wires should be ran under the driver's side sill plate.

just take your time and don't get frustrated, wiring can try your patience, especially since you aren't very experienced with it....