That's not easy. There are so many ways one can do this right. Alternatively, there are even so many, many ways to get this wrong.
What is the budget and what is the time frame.
What is your intention, provide a link only or the entire "package" like the link, switches, routers, etc?
If it is the entire package, I'd recommend that you hire an reputable systems integrator (look for Paolo V who trolls in this forum).
