I'm assuming that means what to do if you're unsure what to defend against?
First round, keep a little defensive, observe everything that your opponent does, and I mean EVERYTHING. Here's how my first round normally goes.
" Ok, he threw a projectile after this string. Note taken. He just used a teleport for the first time. Note taken. He just used tele wake up, for the first time. Note taken. He just used tele wake up for the second time. Note taken. He just used tele wake up a third time. Punish. He always does 2 high hits and then a low hit on a jump in. Note taken."
Basically while youre holding your block up, and trying to guess high low, make notes of the things that are getting through. Try to remember what his high/low normal's look like so that you can adjust your guard accordingly.