I have done a ton and your choice of one will affect how well you do/feel.
As a newb, you will want to look towards one with the appropriate terrain and SAG stops.
there are still a few out there.
Don't under estimate the beauty of good cycling wear and chamios butter. Success will be in the details.
I would try some group rides that have a bit of everything in there and moderate distance-35+.
And yes, do not stop for long- get in and out- or you will have a miserable time. did this on my first Century (Catersville) at mile 55 and didn't feel much better until 81, and then a saddle issue came up.
Be realistic about what you hope to accomplish, you know- is it to finish or get a sub-6?
Keep in mind the pace you have for a century will be different from your normal riding habits and this can take one or two to figure out what works best.
Oh yeah, one more thing:SUNSCREEN!