Most Helpful Girl
Productive, smart, communicates well, thinks about many things (interesting conversations), likes to try new things, isn't afraid of daunting reading material for inspiration, etc.
Above all? PLAYFUL.
Girls like to be respected and protected like your sister, but lusted after like a stripper. Communicate both sentiments every day, and your (future) girlfriend will love you.
You sound like a fantastic guy! Really down to earth, nice, and solid. BUT to date effectively (and to keep your girlfriends happy and satisfied in the long term) you can never STOP letting yourself play the flirting game. Flirt with your girlfriend like you're picking her up for the first time, even if you've been going out for 10 years.
The magic key to dating is not some magic formula...except this: repetition. Just like getting good at math, the key is not to read the books a million times, highlight, observe someone else solve the problem, etc. The key is to just go out and talk to as many girls as you can.
Start with "less attractive" girls that you'd only be interested in being friends with. Chat them up, flirt, focus on listening to them, and building fascinating conversations with them. Practice doing this. Just go and introduce yourself to those lonely girls hiding in corners that don't necessarily look all that gorgeous, but make it clear that they're not used to getting much attention. Spend half an hour to flirt, get to know them, and just enjoy the conversation. Think to yourself, "I am making this girl's day a little more fun". Flirting is a way to improve moods of people all around you!
Don't think of it as a means to an end, so much as a way to help other people have a more exciting day. Don't worry about what you'll get out of it. Just sit back and try to give your best shot at giving another person the gift of a fabulously stimulating conversation. NOTHING boosts a girl's confidence like an unexpected gesture of interest from the opposite sex. Even if she thinks you were just lost or overestimated her (which is very often the case), she will feel much more attractive, empowered, and will proceed in her life with more enthusiasm.
As a volunteer firefighter, clearly you feel that helping people is it's own reward. THINK OF FLIRTING AS A SERVICE TO HUMANITY.
When you do this, you will come across as laid back, but genuine. You will give people better conversations. They will feel like you understand them. They will feel attracted to you, because of the way you made them feel about themselves.
And THAT my friend, is the key to dating effectively :)