You don't have to decide now, but decide at some point what kind of a great cook you want to be. do you wish to be the next Julia Child? You need to go to culinary school. A lot of the TV cooks you see are trained chefs.
do you want to be the best cook in the family, amaze your friends and family? then find some cooking classes near home.
Watch the cooking shows on TV, especially the ones that explain the science of cooking, like Good Eats with Alton Brown, or America's Test Kitchen[PBS]
Check some cookbooks out of the library, look for cooking classes on DVD.
And practice. I learn best when I pick a project that I know I will love, like my lemon meringue pie. I had never made a home made crust, or homemade lemon filling, or meringue, but it turned out great. It looked and tasted great.
By the way, I recommend vodka pie crust from America's Test Kitchen. It really does get crispy, and stays that way. and the pie recipe is theirs, too.
connect into some recipe online sites, like all recipes.com, see what they have, look for something that you know will be a big hit when served.