2) Spelling/Grammar. At the very least, type your guide in a word processor first. Run its spelling and grammar check functions. Proofread your work. An added bonus would be having a friend proofread it before you post it. It’s proven fact, people take documents that are written and spelled properly more seriously than if they see 20 errors in the first paragraph. While I know English isn’t everyone’s first language, that added touch of spellchecking can work wonders.
If you're looking for a good rating, you might wanna check that out. ;o