Yeast should go into the fridge, specialty grains I have put into ziplock freezer bags and have stored in the fridge for 2 weeks, I have read here that some people that have frozen them, but I haven't had that experience yet. Coriander and orange peel, if they are in packaging store in a cool dry place. I only use DME so I really don't know how to store LME I would assume a cool dry place I know heat is bad for it.
If you decide to make a starter try to make it about 24 hours ahead of time, I only use DME to make my starters, and I have made a starter with WLP400 using Wheat DME.
I always make starters now, it is easy and fun, and improves yeast health, cell count and reduces lag time poviding a much healthier fermentation. Bear in mind, when making a starter you are trying to make very healthy yeast, your starter doesn't have to be great beer!
When making starter wort, keep the starting gravity between 1.030 and 1.040. You do not want to make a high gravity starter to grow yeast. As a ballpark measurement, use about 6 ounces (by weight) of DME to 2 quarts of water. If you're working in metric, it couldn't be easier. Use a 10 to 1 ratio. Add 1 gram of DME for every 10 ml of final volume. (If you're making a 2 liter starter, add water to 200 grams of DME until you have 2 liters total.) Add ¼ teaspoon of yeast nutrient(this sin't completely necessary), boil 15 minutes, cool to pitching temp. After you have cooled your starter wort and have it in your starter container (I use Growlers), shake the bejeezus out of it to aerate the wort, I open and close the cap a few times to allow as much oxygen in as possible. After aerating, pitch your yeast and shake it vigorously again. Place foil cap over top opposed to an airlock starters need oxygen. Remeber, every time you walk past your starter or think about it swirl that yeast into suspension to keep the co2/oxygen exchange happening.
Also, wherever you ferment this, it is gonna smell like someone dropped a deuce because WLP400 is the stinkiest yeast I have smelled thus far, but my Wit turned out great!