On TM-Town clients can message you through a "Message Translator" button on your public profile. Any clients or jobs you get through the site are yours to negotiate as you see fit. TM-Town takes no cut of any jobs you might get through the site. The payment method is determined by yourself and the client.
To increase your chances of getting messaged by clients, make sure that:
1) Your profile is optimized: https://www.youtube.com/watch?v=YJJuzA-KzPc
2) You have loaded work and opted-in to the Nakōdo search engine: https://www.youtube.com/watch?v=YjeqWw5JF_4
This video will give you a good overview of the TM-Town platform: https://www.youtube.com/watch?v=BwyoKizl_Mc