For powers, about 55%N1 (on the top gauges) helps in most phases of flight. Do not try to memorise too much- it won't be there when you need it- when in doubt, set 55%N1- for 250kt cruise, for slow cruise flaps up, and for approach, see what it does, then adjust it.
The speed tape has a marker at the next flap setting only, so it is quite uncomplicated. Slow to near that speed, select flap, then set speed at the next flap setting which will appear on the speed tape. You do not have to wait for the flap to reach position before you actually reduce speed, but flap runs quite fast so not a problem.
If you are not used to the pointer ILS display, it can be confusing to start with. You can imagine each pointer is a bar, but on the glareshield in front of your face is a controller for the Nav (map) display, and if you rotate the right hand knob to APP, it will switch the map display over to a large conventional ILS display you will find familiar.
When you lose an engine, put in an amount of rudder, hold it STILL and wait and see what happens. If you need to hold on aileron, if you are steering right, trim rudder right, Steer left, trim rudder left, until spectacle is horizontal. Take it all slow and easy, when ready, call for checklist.
Don't worry too much about numbers and memorising things. keep it simple and concentrate on primary instrument flying only. It is very nice- just keep watching attitude/speed/heading/altitude- everything is on one display. Get to understand the speed display on the left and the altitude display on the right as quick as you can. Don't get upset with yourself- you are not expected to be an expert.
Look the 737 site, but there is another useful as well-
http://www.meriweather.com/777/fwd/pfd.html
Relax- you can only try your best! DO NOT get upset with yourself!