vertical page, Appendix, blank page [closed]

Question

I get confused something about LaTeX and I want to get your recommendation on the following points:

1. How to include a four page pdf file which is horizontal into my LaTeX file? I am currently using this:

   \section{Appendix : Included Studies}
   \includepdf[pages=1-3]{includedstudies.pdf}
   \graphicspath{{./images/}}
   \newpage
   

   in my latex file, but the included files seem vertical. How to make it horizontal?

2. In the appendix it seem like this:

   Instead I want to have this

   Appendix 1: Data Extraction Form
   Appendix 2: Included studies
   

   What i did it is to create a separate file named appendix.tex and in the main.tex file I wrote:

   \appendix
   \input appendix.tex
   

   How to make it, Appendix 1: data extraction, Appendix 2:... ?

3. After it writes “D Appendix: Summary of The Results”, it makes the entire page blank, and after that it shows the content. How can i interrupt it to not leave a blank page?