Question: Hints for rganizing a project?

I am starting a new project and I anticipate creating dozens of files along the way. Each file will need the same collection of definitions, procedures, etc. and I would prefer not to have to copy and pace them as a preamble each time I open anew file. I guess I could write some startup code but would that mean every time I open an unrelated Maple file the Startup code would be laoded? I will be using Maple for other things besides this project. Also, while the stratup code would be hidden most of the time I would perhaps like to be able to see what the n1 procedure is; n1(x) would invoke the procedure-I just want to see waht it does. I usually endup up labeling my files in some lazy way so if I want to go back and find something it takes for ever. Any suggestions for improving that?

Thanks,