No one can teach you how to spar, in order to be good at spar one must unlock their third eye and connect with their inner spirit.

I suggest make two accounts, and use one to practice, spar constantly and each time study your opponent and think of strategic moves to beat them, you need to know where they are going to move next before they even do.

Practice is probably the best tactic out there, you won't become good by reading someones forum post you will become good by discovering what style fits you.