We’ve helped to compile a list of useful trajectory & other flight performance and analysis tools for you. The most popular are OpenRocket and RockSim. Some of these tools are free. Others require purchase. Before you go and spend money on programs, we recommend you give OpenRocket a try. The software is open source and runs under the Windows, MacOS and Linux operating systems – all it requires is that JAVA be installed on the computer.
Open Rocket Tutorial Videos
These videos from YouTube will help you learn how to use Open Rocket features to design and simulate a rocket flight.
Adding a motor:
Running a simulation: