Hey. When in super cruise put your speed marker just below the blue area. This way you will always have 10 % speed of the target distance and you won't overshoot your targets all the time.
So when the target is 1Ls (light second) away your speed will be 30'000 km/s, is it 0.10Ls away your speed will be 3'000 km/s and so on.
Oh and btw: safe disengage speed is 1'000 km/s or lower.
You can find gold in "unidentified signal sources" around "Freeport" and also sell it there on the black market.
"Freeport" can be found in the system called "LP 98-132"
Hope this information helps. See you in the verse, CMDR!