I have used ATB 3.0 software to generate parameters for my ligand and heme group molecules to prepare them for molecular dynamic simulation using Amber version 16 in Linux. However, I found there is a lot of files and I'm not sure about which one I need to use as topology and coordinate file in the amber leap. So, I'm really seeking some help...thanks in advance to those who can help me?

Another thing is, I couldn't be able to use Antechamber in Amber based on the Amber20 tutorial to generate parameter for non-residue ligands because I'm using the old version of amber software version 16. so, after I generated the topology and coordinate file for the amber format, how to call those parameters into leap...can someone help me?