I would like to have regular students and not those who just come and go after a few lessons.
This is not only for money, but as a teacher, it would be better.
ご質問ありがとうございます。
"I would like to have regular students"=「固定した生徒が欲しいです」
"and not those who just come and go after a few lessons."=「そして、数回のレッスンで来て、消えて行く生徒たちではなく。」
"This is not only for money,"=「お金の為だけではなく、」
"but as a teacher, it would be better."=「講師としてその方が良いです。」
ご参考に。