Actually you want to dock port side to (in most situations) with a standard right hand propeller...that's because you are looking for the paddle wheel effect when putting the boat in reverse when approaching the dock.The Rules of the Road (COLREGS) require all vessels to keep to starboard (the right) when negotiating narrow channels and entrances. Having the steering position on the right-hand side allows for better visibility for judgement of clearances.
2.)Most skippers prefer to take advantage of the "paddle wheel effect" of right-turning propellers and come alongside "starboard side to" (right side against the quay).Therefore the wheel is placed on the right for better visibility of the (hard)quay/other vessel when the skipper is busy with the hazardous manoeuvre of coming alongside.
Most engines are traditionally manufactured to turn clock-wise (to the right) when viewed from aft. The propeller is therefore right-turning and this causes a sideways force to the right (called transverse thrust) which helps the bring the boat over to the right.
Tranverse thrust is also known as "prop walk" or "the paddle wheel effect" because the twist in the prop blades means they are scooping water to some extent from the right. On twin -screw boats they sometimes try to eliminate prop walk by using counter-rotating propellers.