Turkish SIM card x temporary mobile & Internet use (Istanbul)

Dear Friends,

I am going to spend 8 days in Antalya and (once there) I would like to purchase a Turkish SIM card to use:
1) on my mobile phone, for local "on the spot" phone calls
2) on my Internet USB key, to access the Internet via my portable Apple Macbook
Can you suggest a specific provider ?
Can you advice about a specific contract, specifically suitable for the use listed above ?
Can you tell me prices ?
Otherwise, could you please forward such question to other members who might help me ?
Many thanks and best regards from Rome !
:-)
Giorgio