When I first knitting and crocheting, I did not realise there was a big online community that did the same thing as I did. I quickly realised that I loved using my hands more than any thing else. The first pattern I wrote was the Diagonal Squares blanket. I took sometime to upload it because I was not sure if anyone would want to download it. To date it is the most downloaded pattern that I wrote.
If you would like to write and sell your patterns you need to come up with an idea of your pattern. Be as original as you can be. The easiest solutions are usually the best.