I am new to this too, but I am in my fourth week with my chicks.
I found that a 250 watt red heat lamp (like in your picture) about 18 inches off the floor got me about 95 degrees. Mine started in the house for two weeks and are now out in the coop with two heat lamps (in case one malfunctions when I am absent). In the coop, it is a lot colder (30s-50s day, 20s-40s night) so I put the lamps a little lower... just over a foot up and the temp is pretty high directly under them (over 100) and then it gets cooler as you move away from them. The chicks just find their happy place in the circle of heat... some closer than others. Then during the day when they are playing and eating, they roam around all over the place in the colder air (draft-free) not under the light. They seem quite happy.
As for feed and grit... brand new chicks need to be on chick starter feed (also called crumbles), which is ground up very finely and they don't need grit to process it. However, my chicks came from Murray McMurray and they suggest sprinkling special "chick grit" (smaller than regular grit) on their food like you would salt on your own food starting on day three. But, again, they don't need it until they start eating other foods that come in bigger pieces. So, if you want to start them on treats after the first week, grit will be needed. Also, MM says that it helps to stimulate gizzard development, so I figure it's a good idea starting on day 3 like they suggest.
Hopefully that helps! Good luck getting your temp on your brooder and give us updates when you get your chicks (with pics, of course!).
