Finally bought multi unit in Texas. Need advice for beginner!

[Junior Shay]

Hello everyone, I’m finally under contract for multiplex property in Texas. Current tenants do not have any contracts and they paying month-to-month. I was thinking to make them sign month-to-month lease at higher price or long term at around the same the currently paying. Also was thinking for them to pay for utilities. How could that be done? Can I use a template or should I speak with an attorney to do so? And am I allow to do that as a new owner of a property? Also what if they do not want to sign it am I allowed to evict them? 

Thank you in advance