Only a few of them will sprout, they will sprout leaves first, about 3-4 leaves, and then shoot out roots, I recommend you just let them be once they root, so place them where you want them to grow.
The bulbs that grow white deposits on them are no good, chunk them as soon as you see them.
It takes about a week to see sprouting, after that depending on your lighting and everything else, they take off, I had 2 in my 55 low tech, sprouted and grew very slow. Although I have 2 in my 20 gal high light DIY CO2 EI dosing, and they grow extremely fast. I would say 4 inches 24 hrs. Pretty plant. PITA with the unusable bulbs.