how do I configure my HP Pocket PC to get online?

I have been given the above i PAQ H4150.UK.I have talktalk as my ISP and a Belkin 54g wireless Modem/router with WEP access.How do I configure the iPAQ to receive e-mail and Internet access.It keeps asking for a telephone number and wep encrip key but when I put in key it says wrong one.Do I have to get a telephone number from talktalk? I put in my home number and still get nowhere. Is there anyone that is familier with this product,if so pleas please help me.I am not very experienced.