[j-nsp] Oversub and routing table in juniper router

[chenoi A]

Hai..frenz...need your help and kind assistant. I have few question here..iam new in isp world and hope you guyz could assist and guide me...thank you 
 
1. For ISP what is the standard ratio for oversubscribe (1:2, 1:3 or 1:4)..Best practice?
2. How to oversubscribe in juniper router? maybe some example will more helpful.
3. i have setup this network
 
provider--------1GB via bgp-------myISP(1.1.1.1/30)--------2M via static route------(1.1.1.2/30)myCustomer.
 
my BGP establish and running fine, i can ping to yahoo from myISP router. I can receive routg table from my provider and setting default route to provider.
 
iam giving 192.168.100.0/27 to myCustomer with wan IP 1.1.1.0/30. myCustomer router already have default router to others provider (0.0.0.0/0 to other provider). how can i set the routing in myCustomer router to ensure it can talk to myISP router via static?
 
and from myISP router do i need to add new routing table? is the routing table look like this 192.168.100.0/27 next-hop 1.1.1.2? or i have made mistake. or there is something to configure more.
 
please help me....i puzzle..to find the solution???
 
TQ