Need help vacating a couple in California

[Abel Sanchez]

BP, hope everyone is doing good, so my question is i have this couple that are staying in my duplex that owe me 2 months of past rent and they have no plans on paying or moving out. i just served them with the 3 day notice to pay or quit. my next question is do i serve them the 60 day notice to vacate after the 3 days or should i just get an attorney to take over my case? thank you for your time.