Well for inspection you have to go Al Wakrah. After you cross the shell round about. You will find it on your right. They are open from 7 am to 7 pm.

For Inspection and Renewal, it will not cost you more than 200 Riyals.
Other charges are Insurance Renewal depending on your policy, If it is a 3rd Party ( 400 Riyals ) or Full insurance (ranges between 2000-5000) depending on your vehicle.
Best of luck.
It will take 4 to 5 hours to finish everything.