|Which window are you creating inside constructor? It is not a good idea to create a window before the object is fully initialized. Constructor is called when you create an object. Once object is created, then you should create a window.
CWnd* obj = new CWnd();
Read about CFrameWnd [^here^]
My guess is you are getting assert at CClientDC dc(this); because 'this' does not point to a valid window because your Create function never succeeded.
In wizard generated code, do you see CSingleDocTemplate object being created anywhere? may be in InitInstance? If yes, then read about that function on msdn. it's the place where view, frame etc are created. You can put a breakpoint in framewnd c'tor and before CSingleDocTemplate.
Having said all that, as far as I have understood your problem, you just need to do this:
In your wizard generated view class, create a CString variable "CString m_strText;"
in your CMyView constructor, put m_strText = "Hello";
and inside your CMyView::OnDraw, draw the text to screen.
Hope any of this makes sense to you,