how can I get my first client?
First, you need to invest a lot of your time poring over several informative forum posts and articles in the Seller Help Center. You then need to put this knowledge to good use by creating/improving your gig(s) and fine-tuning them to the best of your ability.
There is no shortcut to success. You need to put in the effort. If you do that, surely you will have your first client soon.