Some common and minor styling [closed]

Question

I want do some common styling please give me most simple, neat and clear solution for following:

• How can I indicate space between paragraphs? I want distance between paragraphs be more.
• How in article class I can set main font size bigger than 12pt?
• How can I draw a very simple border in every page. (Like ms-word page borders)
• How can I insert a simple header in every page (in article class)

• How can I easily define indent size of first line of paragraph? 1st line of 1st paragraph in each section have 0 indent, how can I modify that?

  \documentclass{article}
  
  \begin{document}
  
  Style me!
  
  \end{document}
  

Perhaps you say that I should ask these in distinct questions, but I think the answers to all of these questions are short.

Answer 1

Here's the answer to your questions. (I really wouldn't add a frame around every page.)

\documentclass{article}

% Adds space between paragraphs *without* removing indentation
%     (not a good idea)
\setlength{\parskip}{0.5\baselineskip}

% Alternative which removes indentation
% \usepackage{parskip}

\usepackage[14pt]{extsizes}

\usepackage[paperwidth=19cm,paperheight=27.7cm]{geometry}
\usepackage[a4,frame,center,noinfo]{crop}

\pagestyle{headings}

\usepackage{indentfirst}

\usepackage{lipsum}

\begin{document}

\section{First}

\lipsum[1-2]

\end{document}