Ali,
Basically connect it all up first...you will need an ADSL Modem/Router, I assume you already either have a cat5 or USB one with your current setup?
So connect up as follows
Telephone line ->microfilter ->Router -CAT5->PC
Set n/work card on PC to DHCP, the router will assign an IP address to the PC.
Open IE and browse to 192.168.0.1 (most routers) this will bring up the router front page, you will need to login to the router, usually by default name - admin, password - password, it will say this in the documentation.
The netgear stuff will automatically run a config which is straight forward to follow, honest!
Once you have done everything you need to, remove CAT5, insert w/cards install drivers etc, set to DHCP and hopefully (he says) you should be able to surf straight away.
The only thing I would ask you to check is what version of PCI your PC motherboard has, as most wireless cards only run on the latest versions, as one guy here found out when he bought a wireless card, and ended up replacing most of his PC to get it running.
Have a look on
www.broadbandbuyer.co.uk for some ideas, they tend to do some good packages - routers and cards etc.
If that still sounds like gobbledegook drop me a U2U