Sorry if this is super basic or complex
1) How good my selection of components is??
I personally see no problems with the choice of hardware from a glance
2) How easy it be to do?
The hardest thing i find is making all the computers find each other.(first install the network cards as desribed below) If you run through all the computers using the windows XP network connections wizard using the same information for each such as network name. Ever its connects via the network or a modem to the internet. Run the wizard on all three computers and share the internet connection on the internet connected computer.
3) If this is possible and is possible walk though of connecting and installing everything so it works!
simple really when you know how first carefully plug in the network card into a free PCI slot and screw into place hopefully with the screw they give you or one in the computer. Boot up the pc and install the supplied drivers and vaula you have workinnetwork cards now run the answer to Question 2 to get it all workin
4) If my NTL cable connection will be able to cope across three PCs?
Yes i will share the connection as it is used.
hope this helps
If you need any more help please feel free to PM me