DId you use the Search feature or read our FAQ? We have an entire section of the FAQ devoted to email, both BIS and BES. I suggest that you start there. BlackBerry FAQ - BlackBerryFAQ
Email doesn't sync using BIS, which what I assume that you will use.
First, you need a BB data plan to have email pushed to your BB. Then you need to make sure that you have "Leave Mail on Server" selected in Outlook's Advanced settings. ANd then you need to set up your email accounts in your carrier's BIS.
And if you really need to have it sync (marked read on both when you read it on one) then you need to get a BES or use a hosted BES solution such as exchangemy mail or mailstreet.