Like user above said, it's better to start with Nicehash :
https://www.nicehash.com/download-centerIt's a software that will use your GPUs (and CPU if you want) and pay in BTC, very easy to use for a first step
Then you can mine ETH with Phoenix Miner, direct to a pool if you want to receive in ETH for example
Do some research here in this section, it's a great resource to learn more about mining
With 5700XT you should overclock memory, reduce Core Voltage and and core clock to achieve better efficiency
Any more doubts, we are here
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