I purchased an acer rubrum kit from the company Jonsteen
Good. Fortunately, you didn't buy a bonsai kit.
it says to wait till the Spring to germinate it. Being that I am in Central Florida growing zone 9b, I was wondering if I could plant the seeds now and they'll
be okay?
No. Follow the instructions.
I am hoping I could also get advice on growing a bonsai from a seed, such as what growing medium, deep or shallow pot, etc...
You're growing a tree. Just follow the instructions that came with the package. You will have plenty of time to study the subject before you can apply any bonsai techniques.
Also:
This is a frequently asked question, that is answered as frequently. Search the forum.
Below is what I am hoping to be able to obtain, or at least something close to it.
That's a very unrealistic expectation. It took 23 years to create this tree - and it was done by an experienced bonsai grower.