You have several options. You can put the Bell modem into Bridge Mode. Instructions on how to do that are on the InterWeb and a Google search will revel them. Ignore the ones referencing firmware uploads, you don't need to do that.
Then you set your router up, plugged into a modem LAN port, to supply the PPPOE credentials. Now your second router does all the logging in and becomes your router. The 2Wire is just a modem. Make sure you remember to turn off the wireless and other services on the 2Wire.
You need a pretty decent knowledge of how all this stuff works, but if you totally bugger things up you can just factory-reset and start again.
Another option, if you're just trying to expand the WiFi range, is to look at one of the wireless access points. They're not expensive (and your existing router may have this ability built in). Basically your WAP connects to your current 2Wire, and acts as something of a repeater.
A related alternative is to leave the 2Wire as-is except turn off the wireless, plug your second router's LAN port to a 2Wire LAN port, and activate the wireless options on it but turn *off* the router functionality. Then it's just a switch with wireless. That's the cheapest/easiest. But again, no two router brands are the same, and the firmware in whatever you have may not allow you access to the settings you need.
The best option is to turn off the wireless in the supplied router and use a second router configured as an access point. Some routers have access point configuration as a standard option. (I use an ASUS RT-N66U which is simple to configure.) Any DD-WRT compatible router can be configured as an access point, it's just not as easy as with the ASUS firmware. Dedicated access points are available but they are not as versatile. Locate the access point in a central location that can be hardwired.
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