Hey MattfromNZ! I'm still learning. That being said, My watchlist is focussed on both small/low floats with (blah, blah, blah) and known stocks with well known Range-Of-Day price action (of course with setups, news, etc). It is both for the quick and fast (scalping) and long haul stocks (those stocks I don't mind holding for the next 3 months or more). If I am going to hold a stock once I leave my home office, it can only be a stock I am comfortable with as an investment stock. Otherwise, I take a loss and leave for work ready to focus on my work. Strategy wise, I focus on levels, and chart pattern for confirmation of entries. BUT, I am not the one to ask about proven strategies and whatnot. There are others far better at this than me. This is just my decided approach to learning, trading, etc.
Scanner wise, I use the gappers list from other sites as I get up to start trading at 7:30EST. If there is nothing there, I have some faithful stocks that consistently move during the day.