CISCO 1841 CONFIGURATION

I have cisco 1841 router and have leased line, adsl connection. leased line for mail server only (Exchange server) adsl for Internet use of my users. I am add the wic – adsl module in my router. My Scenario is two line (isp) adsl and leased line, cisco 1841 router, cisco pix 506 (firwall), linksys switch.
Hope I will get the correct guidelines to immediately
Thanks in advance
Biju