Can you survive your first day in Serbia?

You walk into a Belgrade café at 10 AM. The waiter smiles at you.
What should you say?

A cashier says "Izvol'te!" as you approach the register.
What does this mean?

Someone just introduced themselves. You want to say "Nice to meet you!"
What do you say?

You're lost. You need to politely get someone's attention.
What's the BEST way to start?

You're at a Serbian friend's home. Food is served. What should you say before eating?

Someone holds the door for you.
Quick—what do you say?

You say "Hvala!" and someone replies "Molim." 
What did they just say?

Your Serbian colleague asks "Kako si?"
They're asking:

 It's 9 PM. You're leaving a friend's apartment.
What's the warmest way to say goodbye?

You're leaving a Serbian family's home after dinner. They fed you until you couldn't move.
The PERFECT phrase to say:

Hvala na gostoprimstvu (Thanks for the hospitality)

You walk into a Belgrade café at 10 AM. The waiter smiles at you. What should you say?