Reference data

I am new to NGS analysis. I want to use BWA tool for alignment. How do I get the reference data GRCh37? I am interested in getting the latest version from Ensembl which is release 74. I do remember reading ..Do NOT use masked sequences. Are there instructions on creating own reference fasta files for the alignment? Also i do remember reading that it is very critical to prepare and index reference correctly.

Thanks so much.

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