Save Template my own custom template?

Hello SI Team

I have essentially built the same post (in terms of format) twice now.

http://finalbug.net/blog/entry/471-nle-tracks-roles-part-1-of-3
http://finalbug.net/blog/entry/472-nle-tracks-roles-part-2-of-3

So I am course wondering about making my first template.
I have checked the documentation for this but not found anything.

Please advise how to proceed

thanks

Paul