study of mixed clusters

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Here post your question I am new to GROMACS and would like to study the geometry of a mixed cluster consisting of 10 NH₃, 20 formic acid, and 30 phenol molecules. My goal is to obtain the geometry of this 60-molecule cluster using molecular mechanics.

I have a few questions:

  1. How can I generate the force field parameters for these three molecules (NH₃, formic acid, and phenol)?
  2. Once I have the force field parameters for each molecule, how do I merge them to set up the simulation?
  3. What is the process for running the molecular dynamics simulation with these combined force field parameters in GROMACS?