I always pre-wash all my linen fabric in warm (sometimes hot, but not really hot) water and put it through the dryer on hot; I figure if it's going to shrink, better then than later after I've sewn it up. For general care, I usually use cool-to-warm water, a modest amount of ordinary detergent (for me, that's usually one of the free/clear types), tumble dry medium, and then iron it before wearing it. (Yes, I iron everything, even chemises; I suppose it makes me a glutton for punishment, but I can't help thinking that, for stuff I'm wearing, it just looks much better if I iron it first. YMMV, of course.) If you're not sure how it was dried in the past, I'd say either hang it to dry, or use a low setting on the dryer & check frequently, perhaps taking it out when it's still damp & hanging it to finish drying. Also, since it's been sitting around a while, I'd check it for obvious stains, grease spots, etc., and treat those before washing--a bit of detergent scrubbed in w/an old toothbrush works on most stains, and dishwashing liquid is especially good on grease. Oh, yes, and wash whites & similar shades apart from colors, and red all by its lonesome, but it sounds as if you already knew that. :-)