one switch, two outlets

I want to wire some additional outlets in the basement of a house built in 2001. The basement is unfinished with concrete block walls. There are currently 3 outlets in the floor joists for the first floor. I would like to add some outlets along the walls of the basement. I would have several outlets on each circuit, starting with a GFCI. My questions are: 1) How many outlets can I put on one circuit? From a wiring perspective I think two circuits from the breaker box would be easiest. 2) What type of protection does the electrical wire need? Since this is a basement I think I need to have some type of conduit to make sure that the wire does not get wet. 3) Can I mount the electrical outlet boxes to the concrete block wall? My wiring experience is limited to mounting to studs. 4) Are there any other special considerations I need to take because this is a basement? Thanks in advance, Mike

Hey, I was given an electronic mouse remover that says it works by sending a pulsing signal through the neutral wire and works on most standard wiring. is Knob and tube considered to still be a standard type. do these things cause damage? should I plug it into my outlets?