For betting:
/ bet (name) (amount)
everyone can do that at any time, but if you lose you loose all and if you winn you get your tc + some of the tc of the person that countered your bet. So make sure that there are counters and keep an eye on the ratio of the tc that has been bet.
For dueling:
/duel (amount)
/duel stop
or something like that.
everytime when a fight starts the set amount of tc is taken from your tc and the winner will get all the tc.
Disconnects are counted as a lose.
If you want to get a pause of the duel write /sp to spectate and then /en to enter again.