I would suggest that if you’re just getting started in ranked that you don’t worry too much about your lineup at first. Below 400 or 500, it really doesn’t matter IMO.
You may even match up with less powerful teams if you’re not rocking an insane god squad.
Try a lineup of all postseason cards or another theme team would be my suggestion.
Then, once you hit the 500’s and it starts getting really sweaty, you can follow Lord Blumpkin’s (or everyone else’s) advice.
My .02 cents worth.