Your journey is just starting.
There is a lot to learn, both artistic, and technical.
Using flash we get to control the ambient light exposure separately from the flash exposure, all with a single shutter release.
That lets us create a lighting ratio between the ambient (background) light and our subject.
Light direction and light quality are also paramount considerations.
Visual artists figured out over 1000 years ago that if the main subject(s) in an image are brighter than the background the subject 'pops', or is well separated in visual weight terms, from the background. The concept is codified in the axiom - Light advances, dark recedes.
Put another way, human eyes are drawn to the parts of an image that have dominate visual weight.
In some light situations a reflector or 2 may suffice to light the subject(s) and create a background/subject lighting ratio.
There are some situations that diminish, or even eliminate, the need for supplemental light.
If you can put a subject just inside some shade,have the subject well away from anything in the background, and then spot meter for the highlights in the subjects facial mask, light fall off will naturally make the background darker than the subject.
Balancing ambient light with flash, instead of having an ambient/flash lighting ratio is known as
dragging the shutter.
Posing is an art form unto itself. But again visual artists have over a long period of time discovered which poses work the best.
Many books have been written that show the range of good poses.
Note too that there are masculine poses and feminine poses.
On-Camera Flash: Techniques for Digital Wedding and Portrait PhotographyOff-Camera Flash: Techniques for Digital Photographers
Direction & Quality of Light: Your Key to Better Portrait Photography Anywhere
Strobist: Lighting 101
Post production is also critical to producing a quality final image.
To make sure you have the maximum amount of post production options you will want to make your original images as Raw files, not as JPEG files.
JPEG is a lossy, compressed, ready-to-print file type that was not designed to be subjected to any post production editing.
Photo Editing Tutorials
Learn Photography Concepts
Digital Photography Techniques
Tutorials on Color Management & Printing
The Digital Negative: Raw Image Processing in Lightroom, Camera Raw, and Photoshop (2nd Edition)
The Digital Print: Preparing Images in Lightroom and Photoshop for Printing