How do people level up so fast?

Try not going to Jesters and etc. From my experience, especially on first days and/or if you're really unfunded, you're much better off going to alternative places to level, such as Sahel 1/2.

Then what level should I start going to Sand Rat/Scorpions.

Also, the transportation time seems so long. 7 minutes to get there from Vic Island + they do high damage. How would that be a good choice?