Question Regarding FSM & DCF Models

Hey guys, I was actually trying to model a company using the WallStreetPrep's financial modeling as a guide. Unfortunately I feel that wallstreetprep's guide is a little over the top, but it does help with the concepts.

I realized that every financial statement is different, and I get confused which line items are should and should not include in the cash flow statement. Therefore, it seems as if understanding which line items to forecast realy depends on experience. Can somehow provide me more guidance on my thought process?

Also if there is a professional FSM & DCF Template, may you please link/send it to me?