Hi willdial, welcome to the world of creation. Honestly, if you've never done any sewing in real life, MD might be a bit overwhelming for you to start off with.

First, which modeler do you plan to use so we can find you some good tutorials to get you started on modeling?

But, let's talk about the creation process a little.

First, there's the modeling process. I would suggest starting with something very simple, don't worry about "beauty" as those are skills you add to the modeling process as you learn. Functional is where you want to go first.

Once you have a model, you need a UV map. Again, depending on which modeler you're using some are better than others at creating these maps and they are as vital to a successful model as the model itself. I've seen many good models ruined by bad UV mapping.

After modeling and mapping you need to group the model to the figure it's intended for. For this, I highly recommend Auto Group Editor as it's just the least painful way to accomplish this task.

So, after all that is done, you're actually at the point of rigging the clothing. I have a quick 5 minute tutorial on rigging a dress in PP2014 that you might find useful (P11 is no different, just has some added bells and whistles for rigging you'll need later) https://www.dropbox.com/s/8sj03yo1omb6p6f/WeightMappingTutorial.pdf?dl=0 but you need a created and grouped model to use this.