What the contract must state
That the work is remote; the order and the time of contact; the form in which the result is handed over; who pays for the equipment and the communication costs; how working time is recorded.
The guarantees stay
Remote work is not a type of contract, it is a form of work organisation. Labour law applies to a remote employee too, with the special rules for remote work that the Labour Code sets. Under article 463 of the Labour Code, the pay must be comparable with the pay of the other employees of the employer, and not lower than the minimum amount. The annual labour leave is at least 21 calendar days.
A common mistake
To agree on remote work orally. In a dispute, it becomes almost impossible to prove the working time and the volume of the work done.
Advice
Keep tasks and reports in a written channel — email, a system, a messenger. This is evidence both for the pay and for the overtime.