As someone who is decently proficient in
Photoshop, I can tell you that to get really good at any kind of sig-making or creating custom logo's takes time. Lots of time. There are plenty of videos on
You Tube that should get you on the right path. I would suggest watching as many as you can. There are a lot of good people who offer suggestions and show you tips on
You Tube.
The other option is to join a forum that deals specifically w/ this type of thing. Learn as much as you can and be patient. This kind of thing takes time. I guess what you have to ask yourself is: Do you want to invest the time to get really good at this or do you just want some custom logo's for your football game? Because taking time to get good at photo editing/ logo creating will take some time... and that's time you
won't be playing football.
Just an honest assessment/answer.