It is better you explore first then invest. You can just check out the official account of Bittrex on youtube for guide. I think this is their channel: https://www.youtube.com/channel/UCtkqI5sHrv8NNz0aiDCMe5g

You can even contact their support for assistance. It is great to hold funds on a paper or hardware wallet. Thus, my advise is you create a wallet first to store your coins.