Ok so I went on to creative and was at the spawn so I checked to see if I had a plot with /aem auto. It said I already had a plot but when I did /aem home it said 'could not find plot #1.' I'm not sure if I'm doing something wrong or if I'm using the wrong commands.
Did you click the sign with CreativeMinds? if not, click that then try /plotme home unless you're a donor there.