Heh well .. i can give some pointers.. i still do aqua exercise.
And that is probably the best advice i can give. Go to a local pool or water park. Just be in the water, get used to being in it, don't go into the deep water. Just getting used to the motion of being in the water, is a start. And it has to be done over time, regularly. It must be practiced.
Easy breaststrokes is the best to begin with. It comes very naturally. Watching videos on youtube is a good thing.
Then, going short streaks under water is good practice. Diving under, holding breath, going up. You can hold your eyes open, but using swim googles is recommended. Chlorinated water is hell on the eyes. And it's super fun too, swimming underwater with googles, you see everything. It's like a different world.
When you get used to the water this way, it becomes natural to be in it. Then, it becomes more natural to learn crawl and backstroke as a regular swimming technique.
Many people seem to think crawl is difficult. That's the form that came the most natural to me. It's very easy when you get your head round the technique.
The best way to learn crawl, is to do one step at a time. First thing you should learn, is the kick-off. This can be done in a shallow pool. As with swimming underwater, you stand against the wall with your back to it, dip down under water, and kick off slightly, with your arms stretched out forward, and face down. Let yourself float up to the surface, while breathing out very slowly. Release about 50% of your air, learn to retain some of your air. That is the first technique. Do this until it feels comfortable.
Next step, is to get the first arm and breathing motion practiced. When you near the surface, use your right arm and shove the water near your body along your chest and stomach, right all the way back. Then lift your elbow slightly above water, with the hand pointing forwad. Twist your entire body slightly to the right while doing this motion, and left with the left arm.
While you lift your elbow above water, twist your head to the right, as much as you must to get your mouth above surface level, and take in air. The first times doing this, you should exaggerate the motion, to make sure to get air, and not water. It can feel overwhelming if you get water in your mouth. That is why it is important to practice in a shallow pool - you can stand on your feet and recover your breath.
(Continue in 10 minutes)