Planes walkers

[Harmon74]

Can some one tell me how you play and use planes walkers? I know there is a number on the bottom of the card, and a few numbers with pluses an minuses.  I'm guessing the pluses and minuses affect the bottom number?  Is the bottom number the attack/defense?  Are they creatures?
And while we're at it, I'm confused about transforming creatures too.

[BlackJester]

http://www.wizards.com/Magic/TCG/Article.aspx?x=magic/planeswalkers/week4

Here's some homework. 

[Harmon74]

Thank you.  That helped a lot.

[BlackJester]

Now for the "Transformers":

http://www.wizards.com/magic/tcg/article.aspx?x=mtg/tcg/innistrad/dfcrules

[Harmon74]

Got it BJ.  Thanks.  I didn't realize that the cards were double faced.  Makes sense now.

[cltrn81]

I just got back into MtG a year and a half ago after a 10 year highateous and had to learn how to use the PW as well so don't feel bad