Man, go to that Dropbox link I posted, and pull down the CannaTCInfo.zip file. Inside it there are several books, and one of them is called Plant Tissue Culture, Techniques And Experiments. It’s an introductory textbook on PTC, and, IMO, it’s an excellent resource for basic information.
Yes, for this go around, 14 tubes, means 14 chances. I say tubes, I actually use old baby food jars. There are a couple of places that sell clear plastic caps sized to fit a standard baby food jar. They’re not as narrow as a test tube, so they’re easier to work with.
@Northern_Loki started a thread that has a very detailed guide about the TC process.