Best tip is don't get hit. evade(Dexterity) an parry are your best options with blocking coming in last, these will require you to unlock them in the mastery section. Someone already posted a link to dorky diggety Dave YouTube channel, he will help you out loads, also scan through YouTube an just watch how different people fight an then try to copy it or just learn from it
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While grinding arenas stop parrying and start evading and you will start to get the hang of it
https://youtube.com/watch?v=OPH60F-IETI
Once you get to master level and act 5 you can't even take too many blocked punches so keeping distance and dodging are the best skills to have.