I don't think there is any headset support whatsoever, and from what I've read, you never see any other golfer on the course.
I don't consider myself a pro, but here are some tips.
-Pay attention to who you pick. The two most popular people so far are T-Bone and Max. T-Bone has great power and spin, but not so great control, and he hits a fade (a shot that starts left and curves right). Max has less power, but much better control, and he hits it straight. I rarely use T-Bone, because the courses in the beta have some tight spots that don't suit themselves to bombers, but more precise hits.
-Always take the wind into consideration. In 3, you could toss up grass to judge the wind speed. Now you have to look at visable wind gusts and objects blowing around. Wind off the tee is not a big factor, unless you are hitting it between two bunkers, or over or around an obstacle. Your approach shot is usually affected the most.
This is how I play the wind:
If it's blowing to the east or west between 1-4 mph, I move a few feet away from the hole for every mph. I try to make it so that the wind blows the ball near the hole.
If it's blowing more than 5 mph, I get a little more drastic, and move it even further. It's not uncommon in HSG to have to aim your shot completely off the green and let the wind carry it towards the pin.
If the wind is blowing north or south, the same principles apply, instead of feet away from the hole, its clubs. If it's blowing around 8 mph towards me, I'll take an extra club up and try to drive it over the hole, and let the wind knock it down.
Other things to consider with the wind is that by holding up during impact, your ball trajectory will lower and cut thru the wind, whereas if you hold down, the ball floats more and will get carried by the wind.
Two things that a lot of first timers don't watch for are:
-the effect your lie can have. If you are on a slope, the bottom right corner of the screen will give you the direction the ball is going to travel once you hit it. If it's spinning slowly, the ball will not move that far in that direction, where if it's spinning quickly, it will curve wildly.
-the percentage of getting good contact. Under the ball is a percentage range. This is how much power you can put on a shot. If you hit it into a bunker, the ball will usually be buried in the sand. So if you look at the percentage, it may only say 50%. So if you hit it full power, it may only travel half of the distance.
For putting, it's mainly getting a feel for it. Uphill putts you need to put more power on it, and your shots will curve less than normal. Downhill putts you need to take power off, and they will be more effected by undulations in the green.
Also, you can put forward or backward spin on it. Forward spin will cut down on the distance it travels in the air, but it will roll more once it lands. Putting backspin on it can allow you to overshoot the pin and spin it back, or have the ball bite into the green on long shots.
I could write even more, but just play play play. When I got HSG3, I wasn't that good at all. Now in this beta, I'm finishing holes with 90 seconds left on the clock waiting for people in the between-hole lobby.
BTW, does anyone else play fast? I haven't ran into anyone yet.