I am in a similar situation. My career requires networking to get hired or connect to others in my field. I'm in computer design and graphics and looking for clients and companies. Today I was the most charismatic at my part-time job than I've ever been, but I have been working hard for a long time, and today was only practice. I'm sure I could give you some pointers based on what you already know how to do.
Are you in a business major, or anything similar? Have you had any training in business? What would you consider "basic stuff" -- smiling, eye contact, exchanging business cards? Or a firm handshake, introduction to yourself, and good conversation, maybe?
Also how far along are you in acting? I'm just curious.