What a wonderful goal for 2010! One thing to remember is that you want to sound like YOU! Don't try to imitate someone else. This will cause you to sing unnaturally. Do try to find a voice teacher at least to start. A good teacher will help you with vocal placement and getting the tension out of your throat, neck, shoulders, etc. Just as someone teaching you fiddle would. Also, they'll be able to give you vocal exercises and help you determine your range - as it is now and how it could be developed. Singing is a physical activity so getting those muscles (small though they are) in shape is a must. Learning to support your sound from your abdomen will help with stamina. Also, some people manufacture a sound that's pleasing to their own ears but of course, it really needs to be a sound pleasing to the audience. The sound INSIDE a guitar is probably quite different than what we hear from OUTSIDE the guitar. I believe, unless someone is truly tone deaf, they can learn to sing reasonably well. Remember too though that your voice type may not be what you are hoping for but you need to work with the instrument you've been given. A light voice may not be appropriate for barking out sea shanteys. You may need to find the type of music that your voice fits well with.

Joining a choir is a good idea too because it'll teach you to listen to the others to improve your intonation. Have a great time with it.
Emily