Once you load the genome, start typing in name of the gene of choice in search box. IGV will look the name up and present options. Select gene you need/want. IGV will automatically navigate to that region.

Primary sequence for GRCh37 and hg19 should be identical. Pierre's blog post is from 2013 and the differences mentioned there have likely been reconciled by now.

For all new analysis you should be using GRCh38. Any particular reason you are still using GRCh37? Leave the haplotypes/alternate sequences out unless you have a specific interest in them.

IGV is smart. It will use chr1 or 1 designations in your alignments for chromosomes. So it does not matter if you aligned using UCSC/Ensembl/NCBI nomenclatures.