Determining the value of anything begins with understanding what it is that you have. Bronze is an alloy of copper and other metals. Reproductions can be made of fake bronze. Such reproductions can be offered for decorating. Some allow you to have a copy of a favorite piece for a low price. For example, the famous Pioneer Woman statue in Ponca, Oklahoma by Bryant Baker has been reproduced many times. Some replicas are more valuable than others. Some sellers label a statue as bronze when it is not really bronze. If the statue attracts a magnet, then it was made of iron. Patinas can be faked as well.
Learn how to tell if the statue is actually bronze. Look closely at the statue. If you see a lot of little, uneven holes in the piece, then it is not high quality. Quality = value.
Look around online for a similar product. Read up on bronze statues. Learn all that you can about bronze; how to identify real bronze, how to ID high-quality bronze, what is the artistic style of the piece, etc. Once you have an idea of what it is that you have you can go for a cheap, online valuation. If the valuation suggests that you have a valuable piece, you should take it to a qualified appraiser. Make sure that you learn the replacement value as well as fair market value.