I'm not sure what you're saying is ok.
You only get 1 move action and 1 standard action in a round. You will use your move action to Improve Feint your opponent. You'll need to use your standard action to make an attack, if you want to deliver your Sudden Strike, since when Feinting in combat, you have to make your attack on or before your next turn (per the SRD).
You could always ready an action to attack the person you Feinted if said person comes within range, but there's no telling if your opponent will come up to you.
Unless I've made another mistake in reading the rules, Improved Feint will work best if you are already next to the target you wish to Sudden Strike...
AR