I am buying pre-Bonsai stock and want to know if I should wait until spring to make Bonsai or is now a good time to do it?

You don't "turn a tree into bonsai", it is a process that takes many many years ( decades) and involves numerous techniques on specific moments in the year.
So there is no answer to your question.

In addition to what lucR is already saying, there are a large number of variables even within each one of those techniques, as their timing depends a lot on the species and on your local climate.
And we don't even know where you're located...

I just wanted to know is there a better time of year to move the tree from the plastic pot to a shallow ceramic pot. I have read many different opinions. I am in America right outside of Washington D.C.
I am new to Bonsai.

Hi and Welcome,

Well.. repotting is an action that is done for a reason. Most people new to bonsai start off with putting trees into bonsai pots. People more experiences move plants to bonsai pots last.

The reason: To develop a bonsai, you need top health. Initially when still setting the main branches, you will need the roots.

Maybe you can share a picture or two, and first discuss the route forward?

Thank you! I am overwhelmed by all of the differing opinions/techniques out there to achieve the same goal. When I have time I will post photos of my plants I am working with.

First of all, yes wait until spring.

In the mean time, read up in the How To section about potting, soil mix, tree design, and everything.

Thank you. I have subscribed to the tutorial videos and I am reading everything I can get my hands on. I am a very patient person, and I think that may be the first thing you will need to be successful, along with the training. Cheers to you all!

Wait until Spring.
Dead trees are ugly in the winter.

Clicio wrote: Wait until Spring.
Dead trees are ugly in the winter.

Dead trees are also ugly in summer!