First steps exporting to tex

[Ypo]

Good morning

After reading your interesting advices, I've decided to start my path through LaTeX. I have been some hours trying to start, with little result, but I hope that once established a *workflow* the results will come and the new invested time will be directed just to get better and better results.

My doubts:

a. As first step for my workflow, it seems convenient to use a "template" with the LaTeX preambles. So maybe the many existing LaTeX templates can be used quickly with orgmode. I found several options and opinions. Which one is the best way?

1.  #+SETUPFILE: template.setup -> doesn't seem the ideal way, because the template.setup file must be modified adding #+latex_class to each of the lines.
2.  template.tex -> this could be added to the SETUPFILE: #+LATEX_HEADER: \input{template.tex}. But it seems to have no effect on the PDF output. BTW, I can't use emacs HOME path (~/) in the input header, like \input{~//export//template.tex}. This is my template.tex file content:
   \usepackage{fancyhdr}
   \thispagestyle{fancy}
   \lhead{\includegraphics[width=4cm]{jpg.jpg}}
   \rhead{Student Name: Name\\
   Student ID: 1234\\
   Course: IDB 601 (Fall 2020)}
3. Another friend told me that .sty templates were the best way.
4. I see some people that create customized LaTeX classes and add the desired class to the orgmode buffer.
   
5. Also we can see this intricate transformation of a LaTeX template into orgmode.  How to Migrate LaTeX Template into org-mode
6. ...
   

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b. I think that in a good integration, every character shown on orgmode should be exported into the PDF output. For example "CENTRE LINE SYMBOL": ℄
    How can this integration be done?

I have more doubts, but I will keep reading and trying to solve them

Best regards