Players who actually leave feedback are generally pretty good about letting you know where you've screwed up. For spelling errors, you might try what I do:
1) Google up an online spell-checker
2) cut and paste your text into it, correct it and then CnP it back in
3) ????
4) PROFIT!
For spelling errors, you might try what I do:
Okay, so I need a proof reader to look through my arc and inform me of any mistakes I've made. Unfortunately, I'm not too good at this :/