Administrating Unrelated Multiple Blogs?

How do I create blogs that are simply unrelated but all administered under one account. As of current I only use Google sites & add pages to update my blog. Is this the norm? I am just starting out from blue. I have no idea, appreciate some help? But if there is a will, there is a way?

Right now Blogger looks stagnant & WordPress can’t give me a free domain. Appreciate any form of help or word of advice?