The first item you dug was a snap fastener from the early to mid 1900s. If I recall correctly, they were on some military issue items. The SC button is a great find, and I think the solid silver spoon bowl is an excellent find too.
I think it is a dangerous assumption to make that your thimble was used by a Confederate soldier. I have never, Ever found a thimble in a Civil War camp. It is a safe assumption to make that the thimble was used by a woman anytime from the 1700s up through the early 1900s (when thimbles started to be produced in aluminum as well as brass). Without a close-up of the thimble, one couldn't really say much more about it than that.
And if I might give you a tip or two...
rather than chopping away at the ground in many short, small scoops of the shovel, try to get deeper than the find and get it out of the hole with as few scoops as possible, using slower, more calculated scoops with the shovel. The scraping of the bottom of the hole with the shovel can also destroy a find, so try to avoid doing that. I'm just trying to save you the heartbreak of damaging something really good. The worst part is that a damaged find sits in a display case for years and years as a grim reminder of bad digging habits.
Second tip: You should take a moment and read my post in the "Cleaning and Preservation" forum about cleaning and preserving buttons. You'll find lots of good information there. If you take a toothbrush and water to that button, very little of the silver gilding will be left. What you need is peroxide to remove the dirt, followed by aluminum jelly to brighten the gilding.
The post covers just about every type of button imaginable--from 1700s "dandys," tombacs, and pewters, up to two and three-piece buttons from the mid 1800s:
http://forum.treasurenet.com/index.php/topic,165857.0.html
One more little ID thing--those items you've identified as "CW percussion caps" are not percussion caps. They appear to be brass casings from bullets. Percussion caps were Much smaller than that. Google them and take a look online.
Keep up the good work. You're making good finds, and that is most of the battle.
Regards,
Buck