Read the script carefully
If you are not the one, who has written the script, then you should go through the details before starting the project. No matter you are good at writing or not, you will be able to understand the script quite easily. Once you have gone through every minor detail, you can suggest some changes too, but only if necessary.
Look for some talent in your family
There could be some talented people in your family and you should try casting them before looking at other options. They will definitely understand you better than anyone else and will give their best to make your play successful. If you don’t have anyone in your immediate family, look for talent amongst your relatives.
Search for performers amongst friends
If none of your family members are interested in acting, look for some talented actors amongst your friends. You will be able to find a lot of variety, but you have to cast people, who fulfil the requirements of the script.
Another way of casting actors is to conduct interviews and short list the best possible candidates. You will definitely get a positive response after advertising your need for talented people. However, this process will cost you a lot of time and energy, as it is not easy to locate some good performers.
Cast already famous people
There are a lot of famous actors in every showbiz industry and their services can be bought for your play or movie. You might have to discuss things with their agents first and then set a time for meeting. However, casting a famous actor is not easy, as he/she will look for perfection and will demand a lot of other things from you.