Check what size the header needs to be in your theme settings then open up paint or another piece of software like Adobe Photoshop and create a new jpg or png file then customize it to your liking and upload it.
To add a banner there are a couple of different ways for different places! You can place one in the header, in the body, in the footer or as a sidebar! In the body is the easiest and fastest way and simple past your banner code in the "html" part of your wordpress admin area. If you are using a image simply upload your image and add a link to it!
Their is no banner for dancing in runescape.
You have to slice it in HTMl and later to add wordpress to it.
they have banner codes on the site
Yes, wordpress actually does make money. Two of the ways I know is through advertising on wordpress.com hosted blogs and offering premium accounts. this article might be useful http://www.bizmodeli.com/2009/12/29/six-ways-how-wordpress-makes-money/
You need to be 13 years of age to use the WordPress blogging site.
A Wordpress account is a account at Wordpress.com. Wordpress is a blogging plataform. With an account you can make comments and own a blog. Notice that you don't need an account to make comments, but having one improves the experience.
With paper
Get markers a piece of poster board and make a support banner of whatever your supporting E: breast cancer
It is quite easy to make a web banner and nearly anyone can do it. Free Banner Maker is a good website with easy instructions to follow, but there are others too.
The organisation Reach Local advertises specifically for banner creations. Reach Local invites new and developing businesses to make use of the banner promotions on offer.
Both Blogspot or Wordpress provide free blogs. Though, it's <blogname>.<Wordpress|Blogspot>.com.