Hey,
If you and your Dad are mechanically inclined, u could prob do all the work yourself, and pay like $200 tops in parts...
If u pay to get a timing belt done, it is a MUST to replace water pump also, and u definitely need a water pump if yours was making noise and overheating.
Basically, what u did is REAL BAD...
U drove the car while it was overheating, which is not advisable, because it will damage the engine, if kept running. U say u drove it home, and just as it was about home, u heard a metallic noise?? could be a couple things...
When u ran it while it was overheating, the steam, which is a superheated vapor, tried to escape through your headgasket, which basically mates the head to the block. This damaged your head gasket, which caused water to enter the combustion chamber, hence why u have water and oil on your spark plugs. Your Uncle was right, however, when a headgasket is damaged, the head could show signs of being warped, because the head is aluminum, it can warp when subjected to superheated steam.
Don't sweat it, it could cost upward of $1000 to get it fixed at a dealer, but it's the labor that's expensive, cause it's time consuming.
Get the parts, get a manual, and get to work, u only got a week before school.
P.S.
Hopefully the head isn't warped, if so, u might be able to get it milled, if it's not millable, u might have to get a new/used head.
Hope this helps
Later