So all I have to do is add static routes in Freesco? It's that simple is it?
No it is NOT simple by anyones standards, and even when you are finished it will not really be a bonded connection. But rather the ability to route specific traffic through a specific external connection. Which will be all statically setup before hand ( although that was is what was asked for).
The other problems would be customizing the rc_net, rc_eth, and rc_masq files, so the short answer is usually the best choice.
As for an understanding of PPP connections, it is VERY easy to manually start another PPPoE or even a PPtP sesion which would use the next available PPP? interface. The problems come with everything past that.
If you are afraid that you might make a mistake. The chances are high that you will never learn anything.