First you should lie down and make minimum movements as possible, and then call for help. after calling for help try to set the bitten limb. that's about it, there nothing more you can do by your self. A trained medic would set an IV infusion, but that's something you can't do for your self.
Do not- suck the wound , try to put a vein block, put ice on the wound, try to cut it. those kind of actions would only make your situation much more worth.