Well of course you know the alphabet, since it's the same as in most European languages! People learn foreign languages in their own country all the time, starting at school, or doing it themselves at home if they are really interested.
Free courses for beginners here: www.bbc.co.uk/languages/french , and links to other learning resources.
Buy a good grammar book and learn your grammar off by heart. Buy Bescherelle, La Conjugaison, and learn your verbs. Get as good a dictionary as you can afford. Find things to listen to - maybe a beginner's course with CDs to start with, try your local library. Listen over and over again. When you have learned a bit, try listening to French radio www.rfi.fr
Read what you can - simple stuff you can cope with just now, working your way up to books and newspapers - French newspapers are free online, www.lemonde.fr and www.liberation.fr
Try to translate, not just from French to English, but from English to French - simple sentences to start with, in fact, try and get a schoolbook for beginners, with exercises for you to do.
Try using google in French - www.google.fr