- See if anyone local to you wants to help organise it. Some of the best tournaments have a committee of sorts to organise them.
Decide if you want to do a one- or two-day tournament.
Find/book a venue, decide on cost, will you include refreshments etc?
Decide on a rules pack (team value, skills, special rules, scoring, rankings for the draw, prizes) and write them down, in a pack including contact details, payment details (paypal is good), directions etc. How many games will there be on each day? What will the timings be? Edit: going back through old tournament listings, lots of them just have the rules on here, others have them on a dedicated website.
Get NAF sanctioning.
Publicise widely (NAF, TFF, Cyanide, BB Tactics, local forums, Facebook, Twitter), and be prepared to answer questions.
Sort out trophies.
Download Score and do a trial run of the tournament with the scoring you want.
If it's a 2-day tournament, will you have Saturday evening entertainment organised? Not essential, but again it's the highlight of some tournaments for some people.
Decide on logistics for the day. Will people pre-register their teams? How will you let people know who they are playing against in each round? Most tournaments have a printer, others call out, others have projectors.
RUN THE TOURNAMENT.
Get the results uploaded to thenaf.net.
Post the final standings wherever you publicised the event, along with any good photos and some sort of tournament write-up. Most tournaments take place each year, and post-tournament attention can be a good draw for people coming back.
Have a breather...
Ta,
Mike