To light up a light bulb with a battery, you first must make sure you have the appropriate lightbulb. Different light bulbs will be designed for different voltage, and while the standard voltage from a battery is between 1.5 and 9 Volt (or sometimes with less common batteries, e.g. 12 Volt for car batteries), that from a power outlet is 110 Volt. So you won't be able to light up a typical household lightbulb with a typical battery. Assuming you have the right kind of battery for the right kind of light bulb, attaching the wires so that a current can flow can be tricky. You will hold the wires on tightly in four places (plus and minus poles on the battery, and the two appropriate places on the light bulb, typically on the very bottom and on the thread; at least you don't have to worry about where the plus and minus go on the light bulb, with a standard light bulb that does not matter). There are ways to make that easier, such as battery holders with wires attached (with a spring or the like to hold the battery in place and make electrical contact), or even electrically conducting glue. Otherwise you might want to get a second person to help you hold all those wires in place!