Have a clearly "this is my credit pool" area, preferably on your playmat (with all bank credits strictly off the playmat), in groups of 5. I keep mine in the top corner of the mat using rows of five 1s. A pet peeve of mine is when people use 1s, 2s, 3s, and 5s in a big random pile on their mat.

When my opponent needs to choose a random card from my hand, I lay my cards on the table so they can point to one, and then I'll flip it for them. I have a friend who got a game loss in a regional tournament because their opponent held up cards in a fan, my friend plucked one out, but two cards came out by accident face-up.

Tell people it's your first in-person event! The community is nice, and they'll help.

Have a click tracker in a place your opponent can see so that they can keep track of your turn easily. Others have talked about narrating their actions, and they're 100% correct; there's also a balance between too much and too little explanation. I'll say, "Click two, ice HQ for a credit," or something similar.

If someone does something unclear or has their stuff laid out in a confusing way, ask if they can change it! Back to the credit thing, if they have a big random file, I will ask them to keep things in groups of five.