Union Ink is amazing but AVOID water based inks (and glitter inks are hard to print with. stick to shimmer inks if wanting a "shiny" look)
As for the mesh, it all depends on the logo/design you're printing. The more details in the logo/artwork, use a higher mesh. (110 is pretty standard and works for most designs)
No need to pre-wash shirts before printing but always make sure your boards are clean before printing.
As for mixing inks, get a PMS book (or find online) and it will tell you how much of what color(s) to mix to achieve the desired color(s)
As for the mesh, it all depends on the logo/design you're printing. The more details in the logo/artwork, use a higher mesh. (110 is pretty standard and works for most designs)
No need to pre-wash shirts before printing but always make sure your boards are clean before printing.
As for mixing inks, get a PMS book (or find online) and it will tell you how much of what color(s) to mix to achieve the desired color(s)