Congratulations, keep it up. The first one is such a good feeling If you are able to do all that with just organic traffic then you are well on your way. Paid advertising is expensive and when you spend more than you make it becomes discouraging.
I have found that preselling works better than just having people click straight to the landing page. It seems more personable and people feel like they can trust you more than just pushing a buy now button. Of course everything has to be tested...
You will if you persist. This is me: Most recently (for reference purposes): P.S. Clickbank products are harder to sell than most.
Congrats! The first sale for me is always a sigh of relief / excitement. My only tip is to use that excitement and push it towards even more sales. The 100th sale is always more exciting than the 1st!