Iv youve already got a zero with a flat base, its really... really easy. I can give you walk through if you like. The thing you need to know is where in the scopes adjustment your zero is, and how many moa you need to your intended zero range. Here is a chart I made up to answer that exact question, and help folks decide what options they had with the various +moa rails on the market, and burris signature ring inserts.
If you like give me a call and ill help you set it up... Bill may still have my #