Hi Rosa,

Road Runners Club of America has an excellent list of good guidelines available online at http://www.rrca.org/education-advocacy/etiquette-for-runners/

I think it is important for new runners to join their local or regional club as a wonderful and supportive resource.  Often, this also includes access to the RRCA and additional benefits. 

Hope this helps all and covers the bases. 

Best wishes and happy miles!