Setting up a Reporting Server what is required

I am looking into setting up a reporting server and am looking for advice on the best way to do this and what is required.

Essentially I need to gather 4 different databases from 4 different SQL servers (across a WAN) and bring them back to a single SQL server that will only be used for running reports against using SQL Reporting Services My questions are as follows

1) How do I replicate \ copy the DB from each site in an automatic fashion every night 

2) What version of SQL will this require?