Use Vyatta 4 - question

Hello all,

Currently adminisfration maxim-size network, where reign Windows
Server 2003 and 2008 (fifteenth serwers WWW, three database, two
firewall - one ISA 2004 and one ISA 2006 Enterprise) and hardware
routers Cisco.

Intend exchange servers firewall (two ISA) and router Cisco by Vyatta
(in role firewall and routers with BGP). How then get? Please advice
or links to some FAQs & howto's.

Please answer.

Best regards.