This will be an issue your entire career. You will continue to work with friends, or actors you are friendly with through out your career. Basically, my answer is, treat everyone the same - it's pretty amazing how quickly everyone sort of gets the message.
Now, here's there thing . . . it's a confusing message to go out drinking with your group of friends, partying and such, and then the next day show up and expect them to treat you like the boss - sometimes when working with friends, you might need to put the friendship on hold for a bit. I found, early in my career, until I felt comfortable with my "management" style, I didn't do a heck of a lot of socializing with my cast. I personally found it very hard to be out at the bar with the cast, blowing off steam, drinking, socializing, etc - and then being the heavy the next day (now, granted, I have little issue with that now.) It would be lovely to have it both ways, able to have the great friendships, and then, turn on a dime, a great manager/employee relationship - but to be honest, sometimes those two relationships do not overlap - you just sort of need to make a decision of what is more important.