Either on sprue or if loose/multi-part figures, attach 12 or so to a painting stick once they have been washed and cleaned up.
Then prime - some say black, some prefer white but I use a really dark brown color which saves a lot of work getting at shadows, folds and that bit of hair line just visible under helmets etc. Dry brush with a light white cream or gray color and the detail really pops out, making it easy to block paint the main areas. Do the collars and cuffs before the body of the coat, faces and hands next. Packs and pouches get block painted but straps and slings get a light dry brush. The dark brown primer effectively masks any areas you miss, tones down bright colors and outlines details for you. Brown wash faces and hands an finish by touching up with a light dry brush.
For white uniforms I prime gray and dry brush white followed by an all over dark wash