Ok I am going to take a stab at it. there should be some threads that go into the detail you need if you search.
also you should have a shop manual which will give you pictures and instructions..
1. you have to take off the plastic covers at the bottom of the motor and maybe the crank pully so you can see the timing mark on the crank.
2. put on the cam wheels and take note of the timing marks E (exhaust) and I (intake) on each. set the both the E and I at 12 clock position on the cams and keep the crank at TDC by the little mark etched into the block.
then slide the timing belt on the wheels.
3 note and additional set of timing marks on the back plate to the cam wheels that you also must align. the are at the 8: clock position exhaust an 4 clock position on the intake.
4. you want to adjust the timing belt tensioner, and then rotate the belt back and fourth to make sure the marks line up.
when i take the belt off, i always mark it then i do not have to think just line up the marks and put it on.
there are a number of dimples between the cams that you can count to make sure that it is not one tooth off. someone else can fill that in.