I was going to do a landing tutorial on youtube, but since I haven't yet, here is a short procedure for normal landings:
In no particular order do these:
1: get the barometer QFE from the ATC tower and set it.
2: be sure the active waypoint in the Route manager is set to the correct airport and runway.
3: use the switch LANDING MODE, or hit 'Y'
4: Tune into ILS. [optional]
5: Engage reverse thrust if you want it to engage auto when you land.
6: Adjust the approach length on the left panel with the switch APPROACH. 5.4 or 10.8 Nmiles.
7: Click the button 15.5 for short runways.
Notice there is now shown altitude lines on HUD and radar, start descending to align to them and aim for hitting tangentially the circle shown on radar Pinto talks about. When you hit the approach circle, you are supposed to be at 550Km/h or 297 Kt and 500m/1640ft above the airport, and you just follow the circle around keeping that speed. The approach circle is always 4.1 Km radius. For short approaches you will then immediately start descending when you hit the approach line, and for long approaches you will follow that line until half (5.4 NM out) and then start descending. The HUD will show the 2.86 deg descent line when you hit that 10 Km mark, which of-course fits, since there is 10000m left to touchdown and you are 500m above it, so a 1:20 slope. Notice though that that same line will start to indicate maximum sink rate (2.8 m/s) below 15m (or 35m if radar altimeter is off), so when that happens be sure to keep the flight path indicator above or on the line when that happens to not risk stress the landing gears, but still below the horizon so you don't overshoot. You will notice when that happens if u keep your eyes peeled on the HUD, the line will do a 'jump' and no longer be fixed, and at the same time if ILS/glideslope is set, it will no longer follow that, so last part is always a non aided (except for sink rate) visual landing. Also notice that the HUD will before descent when in landing mode assist you in hitting the 550Km/h speed, by moving the 'tail' on the flight path indicator. That same tail will during descent help you keep your AoA (9-12 or 15.5 if that button is engaged).
And btw. the speedbrakes are not modeled in 3D, only inside the FDM for now so you wont see them, but if extended that will be shown in left indicator panel.