Oh man, Its going to run terrible.....just send it to me.
J/K You'll probably be fine.
4GB will be fine for tracking and light mixing but hold off on the plugins or it will become a hog; best thing to do bounce in place with any plugins as you go, save each version as you progress in case you need to revert. Don't be afraid to commit, DAWs tend to give everyone decision paralysis!
You should up your machine to 8GB as soon as you can if it will handle 16GB.