One of the most common mistakes is "over watering". New growers seem to think more water, the faster they will grow and you end up with "root rot" and then it takes weeks for them to come out of it. If you do what Spurdy says, you should be alright.If you have more seeds, I would start some for "backup" just in case. Better to have healthy sprouts from the start. The new sprouts will catch up and pass unhealthy plants in the long run.
The moral of this story, Don't overwater! lol
Good luck!