Here is a link from the Legal Aid Center of Southern Nevada that has information you might find helpful:
http://www.civillawselfhelpcenter.org/self-help/small-claims
I recommend you explore the site - and it could help you to take advantage of the
free classes offered on small claims actions.
You say you sent certified "demand letters" to the owner and the manager, which indicates you have not filed suit yet.
If the demand letters you sent have not worked to get you the money you feel is owing, it appears your next step is to file the small claims action. Although you
can name as defendants both the owner of the property and the property manager, it is the owner of the property who owes you money. You can attach your text messages and any other exhibits to your complaint, if you think they will assist you in your case, or you can wait to present your evidence in court.
Prepare your complaint(s) as outlined in the link above and serve the complaint(s) on the defendant(s).
Again, the link above walks you through the process and tells you what you need to do. I suggest you take the free classes. Good luck.