How often do you recommend I come to the gym?

If CrossFit is your sole training method, we recommend slowly (over the course of a month or two) building up to 4-5 days per week, depending on how you are recovering in between sessions.
If you are also incorporating a running, weightlifting, or other regimen to train for an event, 3 days of CrossFit per week will be sufficient to bolster your training.