Fng-
Great going so far!
Try thinking of one question at a time and then posting it- you can't really expect everyone to give you all the information you asked for in one thread.
Look up some of the websites for beginner biking safety tips. Then READ them. That will help a lot.
I like to think of it as "cycling SAFETY" rather than "cycling etiquette". And safety is more important than anything else- because if you are not riding safely you won't be riding for very long.
Good luck and stick with it!