SAE 5W-30 is recommended. you can use 10W-30 in warmer climates.
In your owners manual.
Try a dealer or salavge yards
The diagram is in your owners manual.
Look inside the owners manual.
Best manual to get is a Haynes manual for the '97-'03 Chevy Malibu. http://www.haynes.com/products/sfID1/3/sfID2/5/sfID3/17/productID/183
per the owners manual there is no cabin filter.
Register on http://gmownercenter.yahoo.com and sign up for the 02 Malibu. You can download the owners manual from the site.
it should be in the fusebox, look in your owners manual if you have it.
Look in your owners manual or take it to the Chevy garage.
It will be listed in the back of your owners manual. If you lost the manual and your car is faily new, GM has started to keep a record of all manuals on their website. You can just do a quick Google search for Chevy Malibu owners manual, and the it will take you too the gm's page where you will have actually select the year and model again.
use your parking brake this answer is in the owners manual
check your fuses, your owners manual will tell you the location of the fuse.