I've written a viking knit chain tutorial called Introduction to Viking Knit. It's 31 pages filled that answers all those "how do I..." questions!
You'll learn about:
The tools and supplies needed. (Hint, you probably already have most of them.)
How to create a single knit chain.
How to create a double knit chain.
What you need to know about your wire (and what not to get or it will drive you crazy).
An answer for "how much wire will it take me to..." -- how to make a good estimate of the wire you'll need to complete a project.
How to join wire.
There are many, many pictures, with some extreme close-ups of where exactly you need to place your wire - no guessing.