Help! Switching from B1/B2 To F1

[hjyandrew]

I'm living in Canada with a foreign passport, and currently holding a valid B1/B2(visitor) VISA. I'm planning a trip to California from June 9 to June 17 with my friends. However, I got admitted into an MBA program in US last month and just received my I-20 form couple days ago(start date August 12, 2016). I understand that one person can only have one type of visa when entering US. I also know I definitely can not use F1 to enter US in June, because it's too early. Thus, I'm wondering when should I schedule my F1 visa appointment and pay the fees? Can I submit the appointment like now, and just make the appointment date somewhere after I come back from California (after June 17)? If I do so, will I get into trouble when I enter US in June with my B1/B2 visa?