Many thanks to one of our very dedicated Snort Community members, William Parker. In his guides (also posted on the documentation page of Snort.org) he has embedded some Snort Startup scripts.
Because some people are having problems with copy and pasting out of the PDF documentation, so Mr. Parker put these startup scripts in their own files and sent them to me. I created a special section on Snort.org/docs just for startup scripts, and they are all there!
Many thanks to Mr. Parker for updating his scripts based on user feedback, and the new ones are now up.