It is okay, but I wouldn't say it like that. I might rather say "I'm not good at playing soccer, but I want/would like to be. Can you whip me into shape?' I think many native speakers would drop the second ""good at soccer" as it is not necessary. As for using the expression "whip me into shape" I think it works. :)

Yes. It means I am asking someone to coach me so that I can play well - but QUICKLY. I can play OK, but I am in a hurry to play well and I need someone else to help me do this...