Greeting guys.
I am totally new in this area.
I have just got my package with electronics, ordered on Aliexpress.
RAMPS 1.4 + Arduino mega 2560 + drivers...
What should be the 1st step?
I connected power supply, arduino, ramps and display... and i got just 2 stripes on display xD
Then I have uploaded some firmware (Marlin)... everything same...
should I connect all other parts? motors, limit switches, termistors... etc ?
What should i do to get to the stage of testing motors?

Dig into configuration.h you need to set it up with the LCD type you have.