and welcome to the wonderful Digital World of wireless networking.
This is my ideal setup for your configuration:
1. Draytek Vigor 2200WE wireless access point and router - particularly suitable for NTL cable modems.
2. A couple of Draytek Vigor 510 USB external wireless adapters.
That's all you'll need - simply install the USB adapters and connect the NTL modem to the 2200WE. Run the software, configure the network, and away you go. The setup is very simple, and the software will do it all for you.
Overall cost? About £250 +VAT
You can explore the hardware (and order online) if you click here
Good luck, and don't hesitate to come back to the thread if you need more information/help.
Other forum members may have alternative setups to recommend - my suggestions are based on my own experience.