Struggling to publish a web

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   Domain controller setup details

Domain Name: myweb.com
IP Address: 10.0.0.1
Subnet: 255.0.0.0
Primary DNS: 10.0.0.1
Secondary DNS: 10.0.0.3
Primary DNS running on this server

ISA Server Details
Internal NIC: 
IP Address: 10.0.0.3
Subnet: 255.0.0.0
Primary DNS: 10.0.0.1
Secondary DNS: 10.0.0.3

External NIC
IP Address: xxx.xxx.xxx.139 (Static IP Address which is issued by ISP)
Subnet: xxx.xxx.xxx.144 (ISPs default gateway)
Primary DNS: xxx.xx.x.1 (ISP's 1st DNS)
Secondary DNS: xxx.xx.x.4 (ISP's 2nd DNS)

I have forwarded myweb.com to yyy.yyy.y.135 (One of my static IP address, my ISP issued). 

I want to run my website myweb.com from my DC, I think I have to do some DNS setting or probably some setting in network dial up connections that is I am not sure. Can anyone advise me how to go on from here.

Thanks in advance