Im a 24 year old immigrant looking to marry the mother of our 5 year old what is the process?

You would first need to marry. Once married your spouse would file an immigrant visa petition on your behalf. The process from this point will vary depending upon how you entered the country and your immigration history including whether you were previously in removal proceedings. You may be able to seek adjustment of status in the United States or may need to seek an immigrant visa through consular processing.