vba - Select a paragraph in Word and change it's style -

i need find if line in word document starts word picture, , if does, change style of line built in style. believe line begins after return key interpreted word new paragraph , end of paragraph signified return key.

i have single sentence paragraph, style have change if begins word picture. how can search every line of document see if begins word picture?
--edit--
i have changed word picture figure
i'm trying find instances of figure , convert line containing figure boldface (the boldface code replaced code changes style). have skipped error checks, , trying find instances of figure , convert sentence characters boldface, starting point word figure present.

sub macro1()  ' ' macro1 macro ' '        selection.find.clearformatting               selection.find            .text = "figure"            .forward = true            .wrap = wdfindstop        end        selection.find.execute        selection.endkey unit:=wdline, extend:=wdextend        selection.font.bold = wdtoggle        loop  end sub  

here's screenshot of document
detects first figure in line shown in red circle.
found code keeps detecting first instance of figure current position of insertion point on , on again.
how search next instance of figure after detecting 1 of them?
changing wdfindstop wdfindcontinue not work; both produce same result.

i made modification of code searches first last. change way select whole sentence mark bold.

sub macro1()       selection.find.clearformatting       selection.find          .text = "figure"          .forward = true          .wrap = wdfindstop      end  'changed loop      while selection.find.execute 'changed way select sentence         selection.expand wdsentence         selection.font.bold = true         selection.collapse wdcollapseend      loop end sub