One great way to learn another language is always by doing what we do when we are younger. Learn through children's books, start with the basics and work your way up from there.

Or you can use a program like ankiweb.net

Like everything else in life, the best way is with practice. ;)

but how to practice you have any ideas?

Flash card is a small piece of paper or card with a question on one side, and the answer on the other. You look at the question, try to remember the answer, and then flip it over to check if you were right or not.