Found a baby bird, what to feed it? Urgent help needed!

I don't have a whole lot of experience with birds. I know you want to keep it warm, however you can. I've seen people use heating pads and blankets, under part of a small aquarium or tub. I've seen people use heat lamps as well. That would also depends on how warm/cool your house is as well. I know here in the states they sell a variety of "baby butted formulas/foods". And if you look online there are a fair number of recipes to make them too, but I would suspect that to be dependent on the actual species of bird is as well. Do you know what kind of bird it is?