Try some of these links for more info. Since your game is 2D the delta timing tutorial will probably be what you're looking for.
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=gamemorduun03212002.html
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=johnblackledge09202003161847.html
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=jl2k11032002164857.html
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=gamemorduun03212002.html
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=johnblackledge09202003161847.html
http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=jl2k11032002164857.html