You'll find my bio with some of answers to your questions at Post Writers Group. In the meantime, I'll give a shot at some of your questions.
Red and Rover began appearing in newspapers on Sunday, May 7, 2000 after over two years of development. The inspiration was somewhat fueled by the fast-pased times and lack of consideration for others that we live in today, plus, as a parent of two teenage boys, the reflection and realization that before computers and cell phones, life was simpler and the most important thing one could have and count on was friendship and loyalty. Having grown up with dogs pretty much always in my life I decided to combine my love of these four-legged creatures with my desire for those lost days of moon shots, wax lips, rotary phones. Like a lot of youngsters in the late 60s and early 70s, I was a fan of the Brady Bunch -- especially Marcia Brady. What pre-pubescent boy who grew up to like girls as an adult wasn't?. No particular fantasies I can recall -- or dare put down in type.
Red, unlike most 10-year-olds in the comics does not disdain girls. On the contrary, he is quite interested in them, and as such decides to write to Marcia Brady. This will be an ongoing sequence, hopefully for a long time, so I can't give too much away. Except to say that the misspelling of Marsha is intentional in the above strips. Will be explained in future editions. I'm sure fans of the Brady Bunch can understand that other details must remain a mystery.