i am planning to get rims for my car. bolt pattern is 5 x 114.3 but the only thing is that i do not know my offset.

 

I believe it's about +45 for a 7.5" wide rim.... check a few rims for your car on tirerack.com What size are you looking for??? The offset depends on the width as well as the car's geometry. In one of the suspension stickies I posted links to some calculators that can help you figure out the rim dimensions and tire sizes.