How do I use QTikZ on a standalone file

Your file mydocument.tex

\documentclass{article}
\usepackage[landscape]{geometry}
\usepackage{tikz}
\begin{document}
    \input{tikzpicture.tex}
\end{document}

File tikzpicture.tex:

\begin{tikzpicture}
  \draw (-1.5,0) -- (1.5,0);
  \draw (0,-1.5) -- (0,1.5);
  \draw (0,0) circle (1cm);
\end{tikzpicture}

Then edit tikzpicture.tex with QTikZ. Or have I misunderstood your question?

Here is a slight variant, that helps a bit in managing file names:

Main file: (with .tex extension)

\documentclass{standalone}
\usepackage{currfile}
\usepackage{tikz}
\begin{document}
  \input{\currfilebase.tikz}
\end{document}

TikZ File: (with .tikz extension)

 \begin{tikzpicture}
  \draw (-1.5,0) -- (1.5,0);
  \draw (0,-1.5) -- (0,1.5);
  \draw (0,0) circle (1cm);
\end{tikzpicture}

With this variation, the base file name is the same: .tex file is processed by pdlfatex while the .tikz file is processed by the QTikZ

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