It really depends on what you want to do. If the subject is more the outfits, 3/4s and full body shots are good choices. I do this with my cosplay stuff. (See links in my signature.) Head and shoulders shots are popular choices too.
Really, what I recommend doing is browsing Flickr. There's sooooo many model shots out there. You can draw inspiration from them. Two of my favorites are these guys from Taiwan:
https://www.flickr.com/photos/99002729@N07 https://www.flickr.com/photos/12412796@N02
There's a dozen people on the forum here who do great work too. Look at their photos and see what you like. With models, you are limited by only your imagination, really. You can do absolutely anything. Anything. Well, anything the model is comfortable with! But I find that people who are willing to pose are willing to try your whims. Not all my poses or ideas work out and land in the delete bin.
Technique....well, I started mine doing natural light only. Until quite recently, that was mostly what I did. The photos aren't as sharp but you can do fun things. I've personally moved to off camera flashes. Big, big difference. But it's something you may not want to do until you've gotten comfortable working with people. It takes a comfort level, really, because you're kinda ordering your model around a bit. Furthermore, shooting models is actually a fairly intimate experience. You have to look over her entire body, think about what looks best, see her in ways you don't see people ordinarily. It's almost borderline creepy! Professionalism makes the difference but being timid just results in bland photos. Once you get comfortable moving people around and realizing they want you to give them instruction, tell them when they look silly, look for wardrobe and hair/makeup flaws, etc, then you can start making some real art.
As for off-camera flashes, the Cactus works really well. Adorama sells the RF60 + receiver bundle:
Cactus RF60 Wireless Flash With Wireless Flash Transceiver V6 Single DICFLACACRF60 A
The receiver alone is $70 by itself, and if you do another flash, then it's $140 for the two v6's + the cost of the flash, so you won't do better than this deal. The RF60 is powerful and very functional and flexible. I have two of them. Downside is that it is not manual, so you have to do guesswork if you don't have a lightmeter. Really depends on your model's patience.
I also recommend a softbox. Umbrellas are clunky and hard to use. I paid $15 for my softbox. You can get a stand for a similar amount of money or just use your tripod if you have one already.