domain please appraise finance related domains

[debtblue]

hi Guys

After thinking and reading for months, i decided to buy my first investment in "domain names". I bought 4 names thinking they are good. At the moment i have parked them with sedo but i dont know what else to do with them or how do i value them, any ideas:

www.debtblue.co.uk
www.debtblue.net
www.debtred.com
www.pubx.co.uk

thanks