I'm interested in becoming your player. I'd like to have a chance to show your club my soccer skills. I play in a forward position and I can give much joy to your team and become a champion with it.
"I'd like to have a chance to be able to show how good I can play soccer for you club."
should read:
"I'd like to have a chance to show your club my football/soccer skills"
"I'm a forward" would read better:
"I play as a forward" or "I play in a forward position"