I just got a .com domain today and i didnt know what i was supposed to do when it said i have to put in an ip address and loads of different stuff, could someone explain to me what to do? and aswell does anyone know liquid2k's ip address coz i have my site with them, do ye think i should stick with liquid2k? is it the best free host with no adds?

You do not need an IP but rather nameservers. They should look something like this:

NS1.LIQUID2K.COM
NS2.LIQUID2K.COM

Email the support people at liquid2k and ask. :)