No, you may not buy an IC a transport. However, you may buy a drop pod for him + retinue.
You dont need to start with anything on the board.
He is highly likely to come by turn 3. Count on getting half your drop pods in by turn 2, and the other half on turn 3.
No.
And any force you put on the table should wither be durable such as dev squads with 8 man. Or very fast, like LST, Or Assault squads. Both of which wont have a hard time ducking into cover untill the pods arrive.
Good Hunting.