access to internet through a router then to an adsl modem on the edge

Hi everyone,

I have the attached lab at home and trying to provide  HostA and HostB  an internet connection through Router1 Fa0/1 interface which is configured to obtain an ip from Adsl modem dhcp

so far :

I added default routes 0.0.0.0 0.0.0.0 192.168.1.2/24 & .1.1 at the other router.

I can ping from both sids and all are good, but I cant ping the internet modem and How can I get my hosts A and B to get an internet access.

could someone guide me through please.
network-diagram.jpg