Media for New hotspot.... how?

New hotspot.... how?

Hello guys: My project is to create a free hotspot at my building home, a concrete 4 floor, (21x4) apartments building.

My building have a L shape, aprox. 40 by 125 meters Place: Little town on Canada. My experience is none, except for the fact of my own wireless network at home.

I have a lot of questions, but let me start with the basic:

I have to do a special contract with the ISP(Rogers), or almost let they know about the project? Is Bell better provider for the project? If I install AP devices (1 or 2) along the long arm, what model is the best (Cost-Benefit)?, can the devices setup like repeaters and AP simultaneasly? Do you think I need to install AP devices on each floor?

May i use my own d_link DI-624 router?

What software if needed?

Please be patient whit me... and my "Tarzan" english...

Thanks in advance...