If that is your first all grain batch you are off to a much better start that than my first all grain.
You didn't mention a mash temp, but you are probably targeting somewhere around 150*. 75 min should be long enough, but lower mash temps sometimes need more time. 90 min mash wont hurt. I also recommend a 90 min boil, it's just cheap insurance. As far as target mash ph, I might target 5.3 with Bru'n water so that you have wiggle room either way, and still be in range.
Good luck, everything looks good. For dry yeast, next time just use more yeast. Starters are for liquid yeasts, 2 packs of dry lager yeast would do ya good. Pitch near or just under your lager temp and keep it there for fermentation and then ramp it up for a diacytel rest before you lager or bottle. That's if you plan on an actual lager.