Don, the storing of seeds usually prompts lively and passionate discussion here
Some have really neat and inventive ways, some very organized and some not. I'm looking at some point to come up with a better method but for now I use the small plastic zip lock bags, like the size of coin envelopes. I like to see how many seeds I have without opening it. These are bagged up into larger bags of similar groups, "purples," "yellow/orange/white," etc.
Something that I've found in planting seeds is to stick to one type or family of veggies per container. For example, plant only tomatoes in one container and your cukes/squash in another. I like to leave that dome or covering on as long as possible because it helps to keep the soil moist and warm but once you see sproutings, you need to remove it. So consider germination times and growth habits when you plant in those trays because I learned the hard way that some young seedlings grow WAY faster than others.