Yes, read lots of tutorials. It's a great way to learn how to do stuff. But I found it easier to do them after I played around with PS by myself. So maybe you could keep going for a while and after you familiarized yourself with most of the tools you can go and check for tutorials.

Also, this may be a personal preference, but I'd choose a different aspect ratio for a sig. Like 2/3 or half the height you chose.

But as the very first sig you made, it's not bad