Why can't I change the color and size of my text?
Continuity is key and we are trying very hard to make all the pages within McCombs look similar, for branding purposes.
But I really want to change the color of the text, can I just use the headings options to do this?
No! Please don't. Headings are actually more for SEO purposes than aesthetics. You must make sure your headings relate to each other and that there are no subheadings without headings above that. If you start using Heading 5s because you like the font, you better have Headings 4s in there somewhere and they should all relate to each other.
Can't I just cut and paste from the old site into the new one?
Sure, if you want a formatting nightmare on your hands and want to run the risk of not being published. Please use the formatting tools. The more you familiarize yourself with them, the easier things will be for you.
This other site I saw has a cool header and some tabs and stuff I want on my page. How do I do that?
Look into the Add-ons section. There are lot's of fun things there.