Is there any possible to way to hook up My Mesa to some old speakers I have here, or headphones or even my MG's speaker lol?

I really wanna play it!
umm if that's a head I would strongly recommend AGAINST IT

but it is your amp. blow it up if you must. . .
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Provided you know the wattage rating and impedance of whatever speakers you have, then you can go for it. Be careful, though. I'd hate to see your new amp with a blown transformer.
Buy a cab at a guitar shop that has a return policy, use it till you find a good deal on one, then return it.