Don't get overwhelmed by all the fancy stuff you will find in the painting section of the art store! There are always going to be fancy products that come with fancy price tags (read: overly expensive). Walking down the aisle without knowing what you're getting yourself into can become a lot to take on! I remember when I was getting started with oil paints, seeing all the different oils and solvents was like reading an ancient language that I had never heard of before. I'd consult the internet and books on which products to use, but then I realized something, each recommendation was originally coming from some other artist... and it turns out that each of them essentially have a different idea of what works for them and their work. It really had come down to the moment of truth when I started to mix my own mediums and started to realize what was working for ME and the work that I WAS DOING! Experiences are what make us grow. Each piece of artwork is a growth opportunity and should be taken as such. Start simple. Simple ways to get into oils are starting with acrylics and understanding what it is like to have your paint dry within minutes. Traditional oil is a different beast and will dry much slower, but if you want it to dry faster/slower/shiny/matte/texturized/etc., there is HUGE selection of options and Google seems to offer the answer to just about anything now-a-days. So start small, get a couple items you research via web or books, yes, you can still find things in books, and get painting. You'll find out sooner or later what works for you and what doesn't.
In most of my oil paintings to date, I've enjoyed using Galkyd Lite as my medium of choice which in most cases I end up mixing directly with the paint. It typically dries overnight and adds a high gloss to the finish. I've been getting creative with the medium concoctions lately, adding stand oil and poppy oil to play with the drying time and making the paint more fluid. If I could explain the way the oil paint with medium feels under the bristles of my brush with words, I would... for lack of better words, it is "awesome" and complete satisfaction; enough of a reason alone to keep painting!
Keep Painting Painters! You too can enjoy that sensation... today!