For 1/2" below the finished floor, either:
One #10 (extra thick) wax ring OR
Two regular wax rings, preferably one without a horn (funnel) and one with a horn. You put the one with the funnel on top of the one without the funnel. Regardless of what the toilet instructions say, you put the wax ring(s) on the floor and you smush the toilet down onto the wax. You do not put the wax ring on the toilet and then try to position it over the flange. As Terry says, anybody who has installed a toilet more than once always puts the wax on the floor, not on the base of the toilet.
If you don't feel a little resistance when putting the bowl on the wax -- if you don't have to "smush" it down on the wax -- then you need more wax.
If this is your first DIY installation, you may also consider stacking two SaniSeals. You can only use the wax ring once; if you pull the bowl back up or it rocks, you have to start over with the wax, because the wax doesn't rebound. The Sani-Seal doesn't have this issue, and is easy to stack because each closet bolt goes through a hole in the Sani-Seal. I have used the Sani-Seal several times in a stacking configuration, and it works fine. It's just that the wax is cheaper; I use that more often.
Definitely follow Terry's instructions about how to shim the bowl, etc. You can get these from the How To Install A Drake instructions at the top of this section of the Forum.
Also, Terry has an excellent video on installing a toilet: