Maybe post a time frame so people know when to come? Like when will have 8 ppl to start. Cuz its really frustrating if you need to wait for 8 ppl and some people might leave even before meeting the required turnout.
You could set up a few tables, with one player on each table.
Then behind each table will be duelists queuing up to "knockout" the "surviving" duelist on the table.
The "surviving" duelist will try to survive, and each time he survives a duel, he gets a point of somesort, and these accumulate, like if he wins 3 people in a row without dying, then he gets 3 Boosters.
He can choose to quit the table and collect what he has if he's feeling tired (and let the next participant in line to take over him), or he could continue until he dies. And when he dies, he can go and collect his boosters with his "points" Rmb, 1 point = 1 booster.
you could put the entry fee to $4, like everytime they wanna join the queue. Give them a piece of paper or something to represent them as points. So everytime they lose to the survivor they would hand that "point" over to him and that's how he accumulates.
Plus the entry fee ensures that you gain money xD
This is especially good if you wanna start small (one table?).
And as a side note, can you make sure that nobody feels the packs? because if people do feel the packs, then it would be pointless for us to win the common packs, leading to little to no turnout for your tourneys.