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I don't have enough info to be too specific, but based on what you've said, I can get you started.
If the crawl's floor is dirt, yes, cover it w/6 mil plastic. be sure you DON'T go up the walls w/it. And put some bricks, or gravel, or something on top of the plastic all around the perimeter.
If your floor isn't cold, then the heat is doing 1 of 2 things. 1) Is it leaking from ABOVE into the crawl below? 2) Are you actually heating the crawlspace, accidentally or intentionally??!
If it's #1, you DO need to insulate. Use Kraft-side R-39 insulation, and install w/the Kraft side facing the WARM part of the floor. THen use Joist Hangers or chicken wire or some type of 'webbing' (home-made or not) to 'hold' the insulation up and to keep it from falling down. If it's #2, then fix the leaks in the ductwork or STOP heating the crawl. THEN, if the floor is cold, follow the idea in #1's answer.
Now, if the walls leak air, either patch them up appropriately or insulate. However, if water is leaking through those cracks, you need to FIX the leaks from the OUTSIDE first, then patch them up on the inside. Otherwise, you'll be revisiting this problem again and again. Assuming all the walls are not leaking, then you can insulate if you want. Hopefully, your patching of the cracks/leaks will suffice.
RE: Vents - It depends on what's done in your part of the country. I live in SE PA and we vent our crawls, year round. General rule: 1 vent per 150 sq ft of space.
My best to ya and hope this helps.
Jay J -Moderator
PS: God Bless America!