1st) Are you saying you want an extra email address from your own ISP provider?
Most ISP providers offer more than one email address. I use Virgin cable and they offer up to 5 free email accounts only one of which has to be your actual name. At the moment I'm using 3, one for 'er indoors, two for me. One of mine bears absolutely no relation to my name and is not gender specific. You can basically use any combination of letters and numbers, provided no one else has thought of it first.
If your talking about webmail, ie Google, Yahoo, Hotmail you can pick any letter/number combination you like provided no one else has got it.
2) Nearly all the wireless mice I've seen are USB plug and play. The USB thingy (wireless transmitter/receiver) is plugged in and Windows will find and install the drivers for you. Possibly if your installing a gaming mouse you can d/l additional software from the makers to tweak the settings.
Havw a look in Tesco's etc as they often sell them off at good. Picked up a Microsoft one for my laptop couple of weeks ago for about £8.