That's right about stand and seat. You can't get them posted; the choices are email (so you get a digital ticket) or collect from EP, so you can go and collect pre-match.
At 10:00 on Monday, you'll probably be met with a queuing page but once you're on it'll look like it does normally. As long as you're online at 10:00, you should be fine for tickets. It won't be like away games where you've got 5k season ticket holders trying to buy them.
Might be an idea to get onto COWS and have a play around on the Rochdale game or the Huddersfield B game, just to familiarise yourself with how it works, so you know what to expect on Monday: