I would define an enumerate list and create an answer environment: consider the following:
\documentclass{article}
\usepackage{enumitem}
\newenvironment{QandA}{\begin{enumerate}[label=\bfseries\alph*.]\bfseries}
{\end{enumerate}}
\newenvironment{answered}{\par\normalfont}{}
\usepackage{lipsum}
\pagestyle{empty}
\begin{document}
\noindent%
\lipsum[1]
\begin{QandA}
\item question one
\begin{answered}
this is my answer: \lipsum[2]
\end{answered}
\item question two
\begin{answered}
\lipsum[3]
\end{answered}
\end{QandA}
\lipsum[4]
\end{document}

This gives you some flexibility in terms of how you format the questions and how you format the answers. Notice that I kind of sledgehammer the bold font. To counteract this, I call \normalfont inside the answered environment.
The enumitem package gives you a lot of room for controlling margins.
To get further indentation on both the left and right margins, you can write
\newenvironment{QandA}{\begin{enumerate}[label=\bfseries\alph*.,leftmargin=2em,rightmargin=2em]\bfseries}
{\end{enumerate}}
If you want a paragraph indent at the beginning of the answer, then rewrite the answered environment to be:
\newenvironment{answered}{\setlength{\parindent}{1em}\par\normalfont}{}
If you play with these suggestions, you'll find you have a lot of control over the look and feel of the answered environment.
By adding these changes to the MWE, you'll get something like:
