>>2885106some filters are attachable photoshop edits, ie you can edit them in using it with most cases. The cheapers ones can have screwy results too. I assume you got the 18-55mm kit lens with the camera? Macro lenses are pretty expensive, the good ones even used. I got a 18-105mm kit lens and it's great.
Most will suggest a quality 35mm or 50mm prime lens. digitalrev tv on youtube has lots of pros and cons for both. I would spend a few days shooting with you get set at 35mm and 50mm and just see which photographs you like
