HI Cee, if you are trying to represent sampling “points” then the format you will need is as a Vector point data rather than linear data (ie. you have a single point represented by a single co-ordinate).
If you wanted to represent a survey transect or route you took to take the samples, then this would use a “linear” vector format (a line represented by a number of ‘vertices’ which have co-ordinates for each segment of your route going from point A to Point B to Point C etc).