1. Garmin 305. Want to update to the 310 as it is between 180-200 on Amazon.
2. A specialty shoe store can be helpful but can be a dud. If the people know feet well they will get you in a pair of shoes that work with your foot and how you run. I am neutral with slight pronation in one foot but neutral shoes work best for me.
3. I run laps around my neighborhood. 2 laps is ok most nights which put me at around 6 miles but anything more than that and I need a new place to run for fear of boredom. Also reversing the route helps as it almost feels like a whole new place. I have trails near me and some other road spots that I can move to for longer runs but I have to drive (or add an extra 5 miles round trip for the run and some road danger).