Your props need to match the time period of your production. For example, if you perform a play with a plot that takes place in the 1800s, you need to do research to ensure your props match the 1800s decor. A television is obviously out of place in a play that takes place in 1864, but oftentimes a mismatch between props and period is not as apparent as this. You need to conduct deeper research to ensure historical accuracy.
Making your own props can save you some time and money, but it is still important to create a strict budget. Confirm your budget and stick to it. Based on the amount of money you have available, start window-shopping for supplies such as wood, foam, paint and other hardware to create your stage props. Shop around to find the best deals. If you are stretching your budget too far, ask your other stage crew and cast members to supply donations from home.
Large props can be cumbersome to deal with and can hinder the stage performance. It's important to use lightweight materials such as wood and foam when building props. You can style almost any lightweight material into a serviceable impression of another substance. For example, foam -- if painted properly -- can resemble fieldstone. Take a step back and examine the props from the audience's viewpoint to determine how authentic they look. It's all right if your props won't pass the authenticity test up close, as long as the audience gets the proper effect.
Prop construction may require some power tools and dangerous materials. Even if the props themselves are temporary, it is important that you take all the proper steps to ensure safety while making them, just as you would normally with any do-it-yourself project. This means you should wear safety goggles and tie back your hair (if it is longer than shoulder length) when using all power tools. Lift heavy supplies with your legs instead of your back. Do not make skin contact with strong adhesives or other hazardous substances.