Go to kvr and then go into the forums. At the top, there is a forum for beginners, inside it there is a thread that the description says "what is the best...ect" or something close to that. Inside the thread there is a link to the best effects, commercial and free, and vsti's, commercial and free as voted by the users of kvr. You can click the link to each of the recommended effects and vsti's.
It will give you a good start with some solid effects.