Define a service the client can assess
Present the expected result, deliverables and limits of your involvement rather than availability alone. Agree the timetable, approval stages and handling of additional requests; a well-defined proposal supports collaboration with an overseas business and helps distinguish an independent assignment from a salaried role described under another name.
Organise invoicing and the location of your business
Specify currency, deadlines, possible charges and payment arrangements before starting work. Check obligations connected with where you operate, your status and the clients concerned, especially when relocating to another country; a freelance marketplace does not replace organising the administrative and commercial foundations of your own activity.