\usepackage{times}

% custom headers
\newcommand{\firstH}[1]  {\begin{large}\textbf{#1}\end{large}\par}
\newcommand{\secondH}[1] {\textbf{#1}\par}
\newcommand{\thirdH}[1]  {\textbf{#1}. }
\newcommand{\fourthH}[1] {\textbf{\textit{#1}}. }

\begin{document}
\insertTitle%
% ----------------------------------------------------------
% ----------------------------------------------------------

\firstH{First-level Header}
\kant%

% ----------------------------------------------------------
% ----------------------------------------------------------
\end{document}