A couple of things: Terry is right. Most folks don't go to a shop to tune their bows. There are some steps to get this done and much of it can be found by searching on this site and asking questions. There will be no shortage of answers.
Pat is also right. Find a mentor to help you.
With that written, all archers have different ways of tuning bows and the arrows they use. Brace height, nock point, arrow length and so on... There is a lot to think about.
So, when you do find a mentor your personal education will start but in the mean time, this is the best place to find out how to do it yourself. In the end, you will windup with a good friend. (:
I am fortunate to live near some great archers. I have asked and received help many times.
If you have an archery club near you, ask if there are any Traditional archers there and meet them.
I wish you success.
Martin