Errrrrrr
1. When Do i start getting really good enchants?
It used to be 300, bliz has changed those enchants, so they are not so great anymore. the new hot enchants start at about 325(just MY opinion, some folks still love the old "High end" ones.
2. Will i get those enchants from Recipies or do trainers offer some good ones?
most of the goodins are learned via rep and purchase, yet some random drops are still good enchants(TBC stuff is a little diffrent)
3. Where can i find good recipies as in drops and quest rewards?
The best "Drop" recipe befoe the outlands is lifesteal, and you can get it in Scholo, or cursader from the SC folks in WPL. A big chunk of enchants are rep based, so ya better love rep grinding.
4. What should i charge for some of the better lower lvl stuff(skill 30-50)?
You will get diffrent awnsers from folks as to WHEN to start charging for enchats but before about 200 you will be lucky to give them away, much less charge for them.