Configure 1750 with PIX 515E...

I am going to be puttin in a Cisco 1750 router with a Cisco PIX 515E with 6 ports and Unrestricted software. i just need some assistance. I will have a T1 for internet. Below is the ISP information:

Static IP Block: 162.40.148.0/29 Subnet Mask: 255.255.255.248 DNS: 166.102.165.11, 166.102.165.13

I will have 3 different subnets on the PIX, all using the T1 for the internet connection.

I have not set up a T1 on the 1750 before, but i pretty much know my way around the router. I have not even messed with the PIX device before...so, IS there any software that i can build the firewall with from a windows machine? I would like software that i can use instead of trying to use the command line with the PIX.

Anyway, here is what i need.

I am going to draw a diagram below and fix and add as needed.

T1 ---- 162.40.148.1(Cisco1750)192.168.21.2--------192.168.21.1(Cisco PIX 515E)

The subnets that will be connecting are....192.168.0.0/24,

These will connect directly into the PIX.

Here is what i need info on:

What routes do i put into the 1750?: 0.0.0 0 0.0.0 0. 0.0.0 0.