Create a Font Family object
#include <GDIPlus.au3>
_GDIPlus_FontFamilyCreate ( $sFamily [, $pCollection = 0] )
| $sFamily | Name of the Font Family | 
| $pCollection | [optional] Pointer to a FontCollection object that specifies the collection that the font family belongs to. | 
| Success: | a handle to a Font Family object. | 
| Failure: | 0 and sets the @error flag to non-zero, @extended may contain GPSTATUS error code ($GDIP_ERR* see GPIPlusConstants.au3). | 
When you are done with the Font Family object, call _GDIPlus_FontFamilyDispose() to release the resources.
Search GdipCreateFontFamilyFromName in MSDN Library.
#include <GDIPlus.au3>
#include <GUIConstantsEx.au3>
Example()
Func Example()
    Local $hGUI, $hGraphic, $hBrush, $hFormat, $hFamily, $hFont, $tLayout
    ; Create GUI
    $hGUI = GUICreate("GDI+", 400, 300)
    GUISetState(@SW_SHOW)
    ; Draw a string
    _GDIPlus_Startup()
    $hGraphic = _GDIPlus_GraphicsCreateFromHWND($hGUI)
    $hBrush = _GDIPlus_BrushCreateSolid(0x7F00007F)
    $hFormat = _GDIPlus_StringFormatCreate()
    $hFamily = _GDIPlus_FontFamilyCreate("Arial")
    $hFont = _GDIPlus_FontCreate($hFamily, 12, 2)
    $tLayout = _GDIPlus_RectFCreate(140, 110, 100, 20)
    _GDIPlus_GraphicsDrawStringEx($hGraphic, "Hello world", $hFont, $tLayout, $hFormat, $hBrush)
    ; Loop until the user exits.
    Do
    Until GUIGetMsg() = $GUI_EVENT_CLOSE
    ; Clean up resources
    _GDIPlus_FontDispose($hFont)
    _GDIPlus_FontFamilyDispose($hFamily)
    _GDIPlus_StringFormatDispose($hFormat)
    _GDIPlus_BrushDispose($hBrush)
    _GDIPlus_GraphicsDispose($hGraphic)
    _GDIPlus_Shutdown()
EndFunc   ;==>Example