The only sample you turn in is the one Eggen gives you on sole station to turn in. The rest are used for 'crafting'. Talk to Romaine, click all the dialogue options and read them. Click on store and it will show the 'recipes' that are available. You should be able to figure it out from there. If not, do a search for Memory Alpha Crafting guide; somewhere on the forum someone wrote a very good post on how to utilze the crafting function. Most if not all of your questions will be answered there.