I play vanilla, but I don't see how there could be much difference. Level could very well affect decisions, though.
I ALWAYS build a warrior first, then a worker.
I almost always research Bronze Working (BW) and switch to slavery the moment it is done. I usually finish BW a few turns before the worker is done, so he can chop. Agriculture is nice to have before the worker is done, otherwise all he can do is chop.
Finishing BW early allows you to know if/where copper is. This helps you figure out where to build. If copper is not close, you probably want to research Iron Working for Iron. Iron OR copper allow you to build Axemen - a most useful early unit.
Once I get my worker out, I usually go for a settler & send him and the warrior off to settle my chosen spot. This leaves the city bare for a short while, while I build another warrior (or Axeman, if I'm REALLY lucky and have copper really nearby). Since I have slavery, I can rush the warrior if necessary (like some barb warrior happens by). Barb warriors are not a problem early in games on lower levels. But, they can get REALLY pesky on higher levels.