First time Brine-ing a turkey. How infused does it get with the brine?

It tenderizes it more, but the flavours will be minimal, unless you have made slits in the carc. I have done it and cooked it both in the oven and did a deep fried one once, not my favourite way, but the bird is moister and tender , but the actual seasonings and flavour will not be overpowering. For that you would ned to keep it in the brine or marinade for a week.