I am European, living in DC metro area, I haven't got any friends that are interested in riding, so you're my last hope to help.

The last time I rode a bicycle was 16 years ago in Holland to soccer games, I really don't know what bike I should get, I visited REI store (expensive) so one SA proposed a road bike, another one comfort bike.

I know I will be riding on a lot of bike trails, and roads, I want to ride for pleasure and to get in shape.

Please help me with the bike choice comfort or road?
Is it safe to buy used bike?
How do you choose biking shoes? clothes? why cycling jerseys have pockets on the back?

I mean I will take all advice, I am new to the country and cycling.

Thank you

xoxo
Marta