If it's a pouch made from fairly thin leather, don't necessarily bother with the saddler's needles, awl and stitch marker, try a leather sewing needle that you can get from a needlework shop (triangular section needle). I find that this works perfectly well for small bags made from softer/thinner leathers. If you do want to mark the holes evenly, just use the prongs on a dining fork.
Geoff