Got some bitcoin in White Santa Christmas exchange.
I'm not familiar with this term. Could you clarify what you mean? Did you buy the bitcoins, and if so, how did you pay for them?
All I have is a piece of paper that has a mnemonic seed and private keys. I have no idea what to do next to access the bitcoin. Any help appreciated.
Presumably, that mnemonic seed can be imported into a Bitcoin wallet like
Electrum. Only download from electrum.org, and verify the GPG release signature to make sure you're not downloading coin-stealing malware. From there, you can access your bitcoins.
If you're having trouble importing the seed, see
the FAQ.