With 24 teams,the best way to do it would be to have the premier league have a bye. 16 teams then play first round with 8 remaining afterward. The 8 from the premier league then join round 2 which would then have 16 teams also. Round 3 would have 8,round 4 - 4,round 5 - final.
Speaking of that, Tegal if you want to start posting your tips I can record how you go from now on. Just wouldn't have a match up unless another person wanted to be "non league" for the next 3 weeks until the new tipping league season starts. Might poke SurgeQLD on twitter, he played last season and mentioned missing out on the tipping comp.