Adding Exchageserver5.5 to existing site

Need information on how to add exchage server 5.5 to an existing site. The operating system is NT 4.0 with service pack 6. I have an old systme that is currently running exchange 5.5 service pack 4. I want to add a second exchage server to differentserver in domain. I will install exchage and join exchange to existing site. Will i run into any problems. Any info will be appreciated
Thx,