Go to your local bike shop, preferably one that supports local club racing. Take the bike. That way, the shop can make the measurements, order the lines and be there to help if there is a problem. Chances are someone in your local club racing community has done exactly what you want to do, and the shop may already have worked out the best fit on another bike.
FWIW, it took me three tries before I got the length and fitting style that worked best for my set-up.