Life / American moving to Poland. How do I get/What is the cost of a cell phone, cable, etc...? [16]

I'm planning on going to university in Poland and live with my grandmother (who is on "emeryturze"). She only has basic television and no internet because she doesn't really understand technology very well. My parents will be sending me some money every month, especially since the school I will be going to in Poland is much cheaper than the school I was going to go to in the States, and I'm wondering how much all of this will cost.

Since, I'll be staying with my gran instead of on campus, I'll have to sort out things everything there for myself.

So, How do I get/What is the cost of...
Internet?
A Cell Phone (with or without international calling)?
Cable (With English-speaking channels, if possible)?
A Laptop*?
A Bike?

*Should I get a laptop in Poland or in the States? I'm considering a Mac or an HP laptop. I haven't decided which yet.