I had to use WordPress recently for a class. I don't recall having access to only five color palettes (or themes, anyway) but, really, does it matter all that much? You said you want to get started; I'd get started with what is available for free that'll best fit your needs , unless you want to pay for a website (WordPress, Blogspot, etc.). Have you tried Googling for how to get started with WordPress? I just did, and there are tutorials available, including on YouTube.