Starting my online Arabic teaching journey

Hi everyone!
I'm starting out as a online Arabic tutor for non-native speakers, and I have a quick question regarding how to handle pricing with potential students.
Is it better to mention my rate ($5 for a 50-minute session) right from the first interaction or trial message, or should I wait until after a trial lesson/initial trial period before bringing up the cost?
I'd love to hear how experienced tutors handle this, or what students usually prefer when looking for a tutor!
Thanks in advance for your advice!