just keep practicing it.
there are a few exercises that you have to do before start swimming, so you can adjust your breathing to it.
The timing of the breathing depends on which distance will you swim. Another advice is that try to crawl, is not how fast you will do the strokes, is that with each stroke you crawl.
Also when you kick, try not to flex your knees.
And enjoy it!
I have to start swimming soon too!
I hope you understand this, because my english sometimes is not that good.