Essentially, each step is a season's work, maybe more.
Dang, dang, dang, I hate the truth in that statement, but as a newbie deciduous bonsaist by choice I must apply that truth in my bonsai for them to be decent.
@nover18, for "progression" of your tree to bonsai I would suggest you get a clear understanding of what @osoyoung is very simply yet specifically pointing out. I would attemt to clarify, "a seasons work" tends to take a years time. Certain things can be done more than once a year, like removing leaves in order to force more small branches, but generally speaking, you take/make a step (this year) and leave the tree alone to do as you "knowingly" intend it to do, because it will based on what you "knowingly" did. Annnd, next year, take/do another step, and keep in mind there may also be some little micro steps that also need/can be done during major big steps. Dang, dang, dang, I hate this at least decade long time requirement on deciduous.
If you are like certain other people who got'ta have it now, (I kind' sorta did want that, but can't have it with deciduous), my suggestion to you is get some decent pre-bonsai evergreens (there are many), whack and shape it/them to resemble a bonsai, (because you sorta can in one sitting), then over the next decade(s), ya know, like for the rest of your life, simply refine that/those evergreen(s).
Oh, and welcome to bnut. I can't help you with further "progression" of your tree because I'm only a step ahead of you, (already clearly recognise deciduous trees take a looong time). Don't necessarily know what step to do when, or in what order, but am taking steps, and will see what happens with my trees.