GWAS Studies

How to create a .ped file for use in PLink?
I have the following csv file:

Chromosome Position Sample1 Sample 2 ……….. Sample n

Chr                 Pos          Sam1       Sam2     Sam3, Sam 4, ......Sample_n 
1                   11            A          T          T, A, A, T, ......
2                   141           G          G          G, T, T, G, ......

So each row contains the information for nucleotide base for all samples for specific gene locus. I have another file that has information about Phenotype scores for each sample.
My only question is how can I generate a .ped file from my inputs to do GWAS analysis?