i'm 22 yrs old from borneo island...need help to configure this routeros. i'm very new to this. so please help me guys!

anyway, my problem is i already configure my IP address as well as my IP route but still cannot get through the internet. i have 2 interface. 1 is for my LAN and the other 1 is for my WAN. this is how i configure my IP address:
0 x.x.x.x/x x.x.x.x x.x.x.x LAN
1 y.y.y.y/y y.y.y.y y.y.y.y WAN1
and my ip route is:
0 S 0.0.0.0/0 y.y.y.y 1 WAN1
1 DC y.y.y.y/y 0.0.0.0 0 WAN1
2 DC x.x.x.x/x 0.0.0.0 0 LAN
I've also allow DNS remote requests (don know whether this is necessary or not)
and i'm using PPPoA instead of PPPoE. i've gone through the manual but unfortunately it cannot help. any soultions?