Hello, I am New, Please help.

I just Made a Account for the Main Website named Harison567.
Now, I May Ask, Do I have to Put me On a realm? How do I do this? Because Everytime I Try to Login I cant Connect or are the Servers Just down?
Now, I May Ask, Do I have to Put me On a realm? How do I do this? Because Everytime I Try to Login I cant Connect or are the Servers Just down?