Hi, A - The rules are... blah blah blah. B - Ah, I didn't know the rules. I never knew how to play golf. Actually, I didn't know anything at all about golf until a few minutes ago, when you started explaining the rules to me...
I don't know if what I said is ok, that's just what i would say. Let's wait for the others...
Yes, ok. The verb "to know" is usually used in the simple past tense in some expressions with "never" or "always", for example. Other verbs are usually used in the present or past perfect with "never" or "always". I also see you are not quite sure whether to choose a present or past tense... Here's another example: