Some help on the net?

I will urge everyone looking for some help on how to create a card game, to look here:

http://www.wikihow.com/Make-a-Trading-Card-Game

Its a bit outdated, and it does not really apply to ccg/tcg´s, but it can provide you with some starting points.

I would also head over (while you are at it) to
lackey ccg, one of the few places where your game can become an online reality.. most ccg creators huddle up here in the forums too, check it out:
http://www.lackeyccg.com/

Next to that, there is also vassel, the game engine, but I am not too familiar with it.

I was an active member of 4GXG, and helped design the rulebook for thier first project, called Conspiracy ccg. the acitivity is a bit low now on their website, but they are friendly folks and welcome anyone who wants to contribute.: http://www.4gxg.com/

also, on the mtgsalvation forums, there is a whole section dedicated to dreamcards (99% is fixed to magic), but I am sure you can get a good idea of balancing issues and such. http://forums.mtgsalvation.com/forumdisplay.php?f=7

And of course Magic set editor, which you can use (AFTER WRITING THE RULES!) for creating your own card templates, and their forums are buzzing with game ideas as well!:
http://magicseteditor.sourceforge.net/welcome