Latex Beamer template setting with a red frametitle background and the logo at top left of every frame

Latex Beamer template setting with a red frametitle background and the logo at top left of every frame

I'm quite new with Beamer. But when I used it last week, I just couldn't quit. I have a presentation the day after tomorrow, I have already my slides done with beamer. However, my chief hopes that goes with the template of my laboratory, which is available in PPT, not in beamer. I'm trying really hard to apply those template features with beamer, the problem is I don't have much time and I didn't really get there. Sorry I have no enough "reputations" to add an image.
I used no predefined theme and I set the frametitle like this:
\setbeamertemplate{frametitle}
{\vskip4pt
  \leavevmode
  \hbox{%
    \begin{beamercolorbox}[wd=\paperwidth,ht=2ex,dp=1ex]{frametitle}%
      \begin{textblock*}{.12\textwidth}(0pt,-6pt)
        \includegraphics[width=\textwidth]{images/logo.pdf}
      \end{textblock*}
      \hspace*{40pt}\large\insertframetitle
    \end{beamercolorbox}
  }%
}
Actually, what I really want is quite resemble a Madrid theme. I want a logo at top left corner of each frame followed by the title written in white with a red background.
I was planning to modify the Madrid theme so it looks like the content frames. The title page is a little bit different. It has a relatively(30%) wide sidebar in the left with a huge logo at top and a line of website address at bottom. I know it might be difficult to get rid of the subtitles in the sidebar. So I can do it separately in PPT and bond it to other frames. I have the high resolution logo image. Now I really need your help. Maybe that's just few lines of setting which would turn out to be my saver. Thank you for your help.