Welcome to the nuttiest bunch around!
The other people have posted some good information and tips.
My advise to a new entry into the hobby is to take the time to learn what interests you in this hobby. The winter is a perfect time to get your ducks in a row before you start acquiring trees in the spring.
Take a look around here in the forums, watch YouTube videos, buy some bonsai books (show albums and informational), and travel to local gardens (botanical or bonsai). Try to identify what captivates you. Below are some example questions.
-Is it keeping your favorite type of tree small?
-Do you enjoy watching the deciduous cycle throughout the year?
-Do conifers hold a special place in your heart?
-Do you forge your own path or walk along the trails?
-Do you have a good idea on the eventual size of trees you'd like to manage?
-Do you enjoy the process of growing and caring for things?
I understand that you'll probably not find the answers to those questions or similar lines of thinking over the next few months, but starting to identify your specific interest in the hobby will help focus your learning and avoid wasting time on the less interesting things to you. It took me a couple years to really identify the path I'd be walking although I did have an idea early on.
Once you have an idea of what you are interested in, try to find someone near you who has trees that you like the look of. Preferably a professional o or an enthusiast due to their (potential) depth of knowledge and experience of teaching others. A fellow club member can also work. The important thing is to get your hands working on some trees. Having someone to talk with and work with vastly helps out in learning the different aspects of this hobby.
Here is my advice as a grower and what you should expect.
If you are planting seeds, do them in bulk. Having multiple trees of the same species helps you identify potential health issues or technique failures through the growing process.
Growing from seed can a very long pursuit. Don't expect to have anything "interesting" for at least 5 years while you are growing out the tree.
Have a plan for your eventual size of tree as this will dictate the size of bends to put on the seedling and how you'll be managing the young branching (cutting off or doing everything you can to keep the branch alive)
Lastly, as this is the internet, keep an open mind on the advice given here. For the most part, the information on here is a very good resource. You'll need to figure out for yourself how it applies to your situation and environment.