Not knowing what in your opinion is wrong with the vocals I suggest the normal list of variables:
- Your voice/singing. Are you familiar with listening to your voice and are you realistic about yourself as a singer? If your singing is not of a professional level, there's no way you can make yourself sound professional.
- Microphone. Do you have a mic of proper quality for vocals. I don't mention audio interface separately, because qualitywise any of them can produce acceptable results. Though a proper external interface is very recommendable.
- Recording technique and environment. How's the acoustics in your studio?
- There is quite a learning curve for using the effects and whatever the DAW has to offer, so don't expect to get there in a month or two. There are lots of guides on FX and else on tweakheadz.com
There are good books about recording also, like some by Roey Izhaki, can't remember the other big name just now. Those books, however, give you more when you have some idea of the job.
Patience :o)