Schmidty:
Welcome to the forum.
About your questions on beginner's books. I still like John Nelson's book Scroll Saw Workbook published by (the Owner of this forum site) Fox Chapel. There is a link on this page to a web page a Fox Chapel books, or you can find this book else where on the Web, like amazon.com.
Be aware, I saw the book at a local used book sale a month ago. Scroll Saw Workbook is 25 skill building lessons where you cut a specific project fro each lesson which is designed to increase your cutting skills.
For a rainy Saturday afternoon, lots of reading at Rick's scroll site:
Rick's Scrollsaw
The scroll sawing is an eye-hand coordination thing. That means it does have a learning curve to improve your eye-hand movement of the wood past the blade. Not hard to learn, and it don't take long but you must go through the skill learning. The blade does the cutting, you just feed the wood with out deflecting the blade left-right, or too far backwards. Unlike mainstream woodworking, no jigs, fixtures, special tools, or expensive add-ons to buy.
As I have posted before, remember as you progress in your skill learning, you don't have to show everything you make to family. Sometimes the scrap pile can be your confidant. You will know what I mean on occasions.
As for Pinned or flat blades, the issue comes down to there is a greater selection of flat blades. The different blades are for greater flexibility with different cutting situations. The main difference is in pierced hole cutting. With pinned blades, the hole you drill to insert the blade in the middle of the wood project must be bigger to accommodate the pin on the blade. There are many times I have used a #57 or even #62 drill bit in order to pass a flat scroll saw blade.
The metal behind the teeth of a pinned blade is much deeper in order to accommodate the pin. Front to back distance of the blade does limit how tight a curve you can cut.
There are many casual scroll saw users who are fine with pinned blades.
I don't recommend you mess with variable speed for your saw. Very few scroll sawyers mess with the speed control after they find a speed that is good for them. Adjusting the speed of your feeding the wood past the blade is more critical than adjusting the strokes per minute of your saw.
Again, Welcome. Just keep cutting. The more you cut, the better cutter you will become. Hang in there.
Phil