2. Generally you go counterclockwise around the dance floor, this is called the dance line in the national standard dance. Turns and other dance changes are mainly to get a richer dance effect, but of course you should change direction when you get to the edge of the dance floor and continue.
3. You have to use your body signals to tell your partner, but of course this requires more in-depth study. You can start by talking to your partner about what steps to dance.
P.S. It looks like you are just getting started, so I suggest you take it step by step, take your time and don't rush.