Modeling of 20 protein structures at a time

Respected Sir

I have a PDB Id say 1ABC.pdb. I want to use it as a template for predicting the structures of this protein's point mutants.

I have another file say 1ABC_mutant.txt . It contains fasta format sequences of 20 point mutations of the protein sequence of 1ABC (above mentioned) protein.

So , I have two input files:

First file: 1ABC.pdb (Template containing coordinates of the protein structure)
Second file: 1ABC_mutant.txt (20 Query sequences with one point mutation at a time in each sequence).

Please find the attachments to know the format.
Please reply as soon as possible.

I am a NEW USER TO LINUX.
I would be grateful, if you could listthe steps in little descriptive manner.

Please help.

Thanks.