Hey there, you sound pretty upset about your seeds, so I thought I'd try to ease your mind a little. I've found that with any plant, the best thing to do is to allow nature to take it's course. When plants die, most of the time it's because someone "loved them to death" LITERALLY! We tend to over-water, over-feed, over-handle, and/or over-dry them. We put too much light on them, leave them in the sun too long, put too much fertilizers on em and burn the hell out of them, and we water them so much they drown.
Your plant CAN be saved, but only very carefully... by carefully, I mean LEAVE IT THE HELL ALONE! I know that's really hard to do when we're talking about our "babies", but you can "love em to death", so back off a bit.
Before you do anything else, you need to get yourself a spray bottle. You can buy a new one or just use an old windex or cleaner bottle... just remember to clean them very good before using them on your plants. Set the spray bottle so that the water sprays out in a fine mist rather than spews out really hard. I use the spray bottle until my plants are about a foot tall and have several leaves on them. That way, I KNOW I'm not hurting them. When your plants are bigger, you need to get yourself a watering can from a dollar store or WalMart. They usually cost anywhere from a dollar to three or four dollars. Also, when you water, you DO NOT want to pour water all over the plant, you only want to water the soil underneath the plant. For now, give your plants about 50 to 100 squirts a day, depending on how big your pot is, and make sure you water it in the mornings so that they have time to dry out in the sun before night time. Watering them at night can cause them to mold and leaves them open to diseases and pests.
As for what you should do now... are your roots still attached to the seeds? Or have you broken them off? If they're still attached, make a hole in the soil with a pencil and drop your seed inside. Loosely cover it up, then spray with a few squirts of water. Another neat trick is to put about a capful of hydrogen peroxide into your spray bottle with the water. It'll ensure that your plants get plenty of oxygen. So, spray with water and peroxide mix, (like I said, only a capful added to your water bottle, you don't need much) and set your plant in the SHADE!! You need to do what they call "hardening off". If your plant has been inside, you don't just go and set it in the sun all of a sudden or you'll kill it. You need to gradually introduce it to the sun so it'll get used to it. So, the first day, leave it in the shade. The second day, let it get about 2 hours of sun, then put it back in the shade. The third day, allow it to get about 4 hours of sun, then 6 hours and so on... by then, you can allow your plant to stay in a full-sun area all day and night. I think it's best to allow your plants to grow outside if it's at all possible. That way, you won't have to worry about how many hours per day it needs light and dark, and whether or not your plants are getting the right kind of light and so forth. Nature takes care of all that stuff if we just allow her to, ya know? Leaving your plants outside takes all the guesswork out of it all.
Allowing your taproot to dry out one time doesn't automatically mean it's dead, so don't worry so much about that. Just make sure to leave it buried from now on.
So, to summarize (because I know I have a tendency to ramble, lol). First, bury your seeds again in some good soil (don't buy cheap shit for this purpose) use a pencil to make a hole, then drop your seed inside. Water immetiately with a spray bottle of warm water with one capful of hydrogen peroxide mixed in. Then, put the pot outside in the shade, under a tree or on the porch or something... somewhere where it won't get any sun for a day. Then harden the plant off... water it every morning, then allow it to have 2 hours of sun the first day, 4 the next, 6 the next, and so on. Keep watering your plant every morning, USING A SPRAY BOTTLE because a watering can or the tap or waterhose is way too strong until the plant is MUCH bigger. I'd give it at least an extra week or two to get back in the swing of things and start growing again. It's going to need a little time to settle back in and fix any damage that's been done to it, so don't get discouraged if it doesn't grow and break through the soil for a few weeks, just keep watering it every morning and be patient!