I Want To Learn To Swim - What Should I Do First?

First of all you should find someone to help you, you want to be safe when you swim, sopmeone that can give you some tips. Once you have some one willing to help you learn, find a safe place to practice.  A pond, lake, somewhere calm is best place to begin.  A crowded pool may not be the best place to start, all the commotion could make you nervous or rob you of a practice space.  Practice your strokes, techniques, basic stuff.  

Depending on how you want to swim (for fun, to compete, ect...) you will have to find someone who knows which strokes are best.  You can use some type of flotation device to help you stay afloat until you can do so on your own.  Once you can doggy paddle along new strokes will be fun to try out.