Hi,
this is a challenging area. Dowsing is good but you can effect the dowser with your thoughts so it is not infallible. If I were you I would ask for a 'physical' experience to gain a yes and no, for instance. Tell your guides that you would like a yes 'feeling' and a no 'feeling' that are obviously different. They are very helpful and will provide these basic feelings that will help you get going,
dave