groovycards.co.uk - This is a "brandable" name, where someone has to desperately want the particular name for their new business. There is a small chance you could sell this on for a decent amount, but you will have to be lucky. It's a fun name but quite hard to sell on.
fantastic-cards.co.uk - Very unlikely that someone would buy this hyphenated name off you. Even with the non-hyphenated the chances of a good sale would be slim but not impossible, like the first name.
ibiza-clubs.co.uk - Limited value because of the hyphen, but term probably gets traffic so you could build a site for it. Non-hyphenated would have some value.
clubsibiza.co.uk - You might get a low value sale here.
p0k3r.co.uk - I don't feel this name has value, but I'm not an expert in this type of name.
My advice to a newbie is to attempt to sell some of your names before you reg too many. The market is a great test of the worth of a domain. Also, you need to approach end users to achieve maximum value, it's generally reseller prices on here.
Good luck.
Rgds