Answer to updated question
You have several options, including:
\documentclass{article}
\begin{document}
\begin{enumerate}
\item hello \\
\hspace*{0.5 cm} it's me
\end{enumerate}
\begin{enumerate}
\item hello \\
\mbox{}\hspace{0.5 cm} can you hear me
\end{enumerate}
\begin{enumerate}
\item hello \\
\null\hspace{0.5 cm} from the outside
\end{enumerate}
\begin{enumerate}
\item hello \\
\hbox{}\hspace{0.5 cm} how are you?
\end{enumerate}
\begin{enumerate}
\item hello \\
\vbox{}\hspace{0.5 cm} from the other side
\end{enumerate}
\end{document}
See also e.g. How can I force a \hspace at the beginning of a line?
I don't know about the ins and outs of these, but there's other questions for that on here answered by more knowledgeable people than me. Sorry for my previous somewhat rude answer, and all the best! :-)

Previous Answer
\documentclass{article}
\begin{document}
\begin{enumerate}
\item[please \hspace{0.5cm} include] \hspace{0.5cm} MWE
\end{enumerate}
\end{document}
