Use baking soda and the reef chemistry calculator: (this is the same as Bryan's link)
http://home.comcast.net/%7Ejdieck1/chem_calc3.html

You should use the salifert alk test kit. When your alk is in a good range (8-12dkh) you can dose some calcium chloride to get your Ca level around 400-420. (Use the salifert Ca test kit) Then you can get going on a balanced dosing scheme like b-ionic or Randy's two part recipe.

If you go to reefcentral, then the reef chemistry forum, then find the sticky with the links to Randy's articles, you'll find great, no BS info on how to manage the Ca and Alk levels of your tank.