The next transfer window is due to open after the completion of Round 10. If you wanted to begin your planning now then I would recommend having a look at MTB's excellent Team Analyser feature (it's not just for making fun of Butters fantasy team )
It should give you a good idea of peoples Round 13 numbers and remaining trades, so may help you find someone who is going to do well in the first bye round and get rid of someone who is not
If you need to match a user name with a team name, you can find that information here