Okay, how do I ice? 
When you turn the pan over to release the cake, do you ice what was originally the bottom but is now the top?
I'll be using the Wilton's Ready-to-Use Decorator's Icing...I need to water it down to do a thin coat first, right?
I'm so confused, and such a beginner. I dont know what to do/where to start.
Michelle
Yes! Use the bottom of the cake as the new top, so you get a nice flat surface for decorating.
I don't know about everyone else, but I don't thin my icing before doing my crumbcoat.
I like to do a thin crumbcoat, then put the cake in the fridge for a few minutes to allow the icing to set a little, then do my final coat.
You need to check out Melvira's paint roller smoothing technique. It works very well. I'll find the link to the thread for you...
Yes, you will be icing the bottom, the reason for that is it is completely flat and a better surface.
If your cake top is not flat (has a slight dome) you need to trim that off so the bottom will be flat as well, and your cake will sit level.
I've never used the Wilton icing, so I can't help much with that , but if it is too thick to spread then, yes, you would need to thin it a little for a crumb coat. If it spreads all right, you would just spread it thinly for the crumb coat, let it sit a few minutes, and then apply another coat of icing for the thickness you want. (I make the Crisco buttercream icing myself.) Hope this helps a little.\\
Janice
Here's the link to that thread:
http://www.cakecentral.com/modules.php?name=Forums&file=viewtopic&t=49423&postdays=0&postorder=asc&&start=0
Read the first post to learn the technique!
Thanks so much!
Okay, so the first coat of icing is thin, then chill the cake in the fridge for a bit.
veehaytx What is the Crisco buttercream icing?
What is now the bottom of my cake is flat, because after I took the cake out of the oven, I pushed the top of the cake down, to make it level. 
I plan on coloring the icing green, because the cake is (hopefully) gonna be a Christmas tree. So do I go ahead and do my first layer of icing green?
Not a stupid question at all.
Kudos to you for wanting to do it right!
Yes, the top of the cake becomes the bottom. You do it this way because if you cut off (some of)the top of the cake to level it. it'll crumb into your frosting, and because the bottom of a cake is always level.
How to level:
http://www.wilton.com/cake/cakeprep/leveling.cfm
How to stack a 2 layer cake:
http://www.wilton.com/cake/cakeprep/stacking.cfm
How to frost:
http://www.wilton.com/cake/cakeprep/icing/index.cfm
Info on what to add to Wilton canned icing:
http://www.wilton.com/cake/icing/icingchart.cfm
HTH
Thank you for the links Jan!!! 
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