It depends upon your formatting in the CSV file ...
Put each layer information on a seperate line .. i.e.
Name,color,linetype,lineweight,plot style,plottable
thislayer,green,continuous,0.1,PlotStyle1,yes
Then read each line successively
(setq thisline (read-line file))
break down the line according to commas (or whatever your delimiter is) then pass the vars to the layer creation routine.