Getting There

I have the following questions:

1. Is it easy to find a safe transfer (bus, train) from the Airport Halim to a private address in Menteng, and how much does ist cost (in general).

2. Can you give me the address of a tourist office for one day sight-seeing tour in Jakarta

3. Is it possible (for a tourist) to go to the railwaystation in order to buy a ticket (for instance) to Bandung on the same day of departure

Thanks in advance