I find that it is better to plant the seeds in a small pot rather than on wet paper or something.It is to easy to damage the little thing when you are trying to plant it..
I would sugest that if you wont to no if the seed is going to germinate as quick as posable let the seed crack then you no it is germinating put it strait into the soil .
To answer your question i would plant it strait away.No good leting the root get sunlight...