I would net first, then vac. I don't have a robot so that answer depends on what you have. I'm not an expert on bots. If the filter on the robot will fill up quickly it's a waste of time until you get the big stuff out.
As noted above adding other chemicals can be a mistake until you know what's already in your water. I sound like a broken record but that's the way it is. You can't go wrong with adding bleach. Save the other stuff until you have a handle on the chemistry and a track record on how your pool reacts.
As noted above adding other chemicals can be a mistake until you know what's already in your water. I sound like a broken record but that's the way it is. You can't go wrong with adding bleach. Save the other stuff until you have a handle on the chemistry and a track record on how your pool reacts.