Fitting Alloy Wheels...

Before you do anything, check to see that you the right sort of bolts - Bolts and studs have various diameters, threads and seatings, your wheel supplier should be able to advise on this. Also check to see that you the 4 plastic spigot rings which help the interface between the wheel and the hub.

Next you need to jack your car up - do this securely and be sure to use axle stands, chock wheels still in contact with the ground and apply the parking brake.  Offer a wheel up to the car and check that the bolt holes line up, that the wheel locates on the hub correctly and that there is wheel arch, suspension strut and brake caliper clearance [if you have upgraded your brakes be SURE to seek advice and measure everything thoroughly BEFORE you order!].
The wheel bolts or nuts must be tightened to the manufacturer’s specified torque. [Be sure to re-torque the after a 100 miles or so as they will compress slightly] tighten them progressively 'till they're 3/4 tight then lower the car and complete the process.