I'm a beginner who started around when POTD Rodri came out, and I need some serious squad advice.

Oh, for a beginner, you've got quite the luxurious set of pieces. Attacking with a quick counter centered around that Rodri is the current trend. You already look pretty strong, but if you want to aim higher, you should polish your defensive stability!

I think the player selection is good, but personally, I think it's okay to include a fullback.