3 guys looking for a dynasty start up

We are 3 guys from the UK. Currently play in 2 very competitive home leagues: 1 keeper and 1 redraft.

We would like to also have a dynasty league on the go as well however there were only a few of us from the leagues that wanted another on the go.

Not really looking to have a buy in if possible and preferred format is 12 team 0.5 PPR.

Formats we are currently using are the NFL app for redraft and sleeper for the keeper league.

We could potentially got 1/2 more involved from our home leagues if they are needed to fill the league.