No problem!
If you don't finish much, take a look at who you're talking to. I only ever finish a few of my sketches.
A few Toontown groups for you to start with can be found on my profile. (On the left, at the bottom.)
Once you've clicked on a group, press "Join our group" (above the big blue box saying "contribute") Your request may take a while, depending if the leaders have it on auto approve.
Once you've been approved, check if there are any rules in a group journal or on the group home page. (Some groups don't have any.)
Then you can submit your art. Go to the group Gallery. Some will have folders on the left. If it does, go to the folder that the art you're submitting applies to. If not, sip that step and just submit to the main Featured folder. Press "Contribute to this gallery" on the right, below the green watching button. If it's missing it means that folder isn't accepting submissions. Try another folder or group.
Good luck!