Well, don't fret, worlds can take years to finish, depending on how much time you have on your hands. I've never been successful at creating my own world, I gave up before I was barely started.
There is tons of help and info here - http://modthesims.info/t/forumdisplay.php?f=616
And if you do a google search for "sims 3 caw enable objects" you will find many objects available to use with the Caw tool. You can find instructions on how to install so they show up both in caw and in game.
Roads are tricky at first, but once you get the hang of how they work they are actually kind of fun. I found that if you place the intersections where they are needed/required first helps alot. Then place small sections of road inbetween - then drag them into place. You can even bend/shape those small pieces of road easier if it's not all one long connected road. Always use the grid when doing your roads - sims love good roads. Here is another great website for help with caw...
http://krrank.blogspot.com/
Good Luck!
