Thinking of joining the National Guard, but MOS question?

I would like to get into something along the lines of Administration or Human Resources in the Guard if I decide to join since these lines of duty relate best to my civilian job working in an office at present. Anybody have any suggestions or comments on these types of MOS's in the National Guard, especially relating to Illinois if possible? Also, where is BCT and AIT normally held for MOS's in these types of positions? Any help would be awesome!