Earth Invasion Plan
First, I would attack and secure the major agricultural resources of the earth. Priority would be given to the highest yield areas that are far from large populations.
Second, I would leak photos of our alien species at these farms on the internet, especially on dubious crowd-sourced sites. The photographic evidence will convince the masses that any rumors of an invasion are a hoax. How? Humans, always confident in their own opinions, cling to their preconceived ideas even tighter in the face of evidence. The photos will surely be dismissed as doctored by pranksters and perpetuated by conspiracy theorists.
When individuals come to investigate, they will see armed guards dressed in uniforms bearing the Monsanto insignia. Unable to get close to the operation, they will return home to spread the news that the evil geneticists are trying to kill humanity yet again. We shall add to the internet speculation by suggesting that the corporation is covering up evidence of harm caused by GMOs, or that monoculture growing practices have enabled widespread pestilence. A bulk of the population will engage in bitter debate without even trying to discover the facts.
As food becomes scarcer due to our tight control of the farms, we will suggest malicious intent by any and all as the cause. No doubt it is Big Pharma that's to blame, since they are working on a medication replacement for food. Or certainly the Government is hoarding the food and denying its people in order to subjugate them. And it's highly likely that this is an act of terrorism.
The world will be in such a state of panic, backbiting, and hunger that they will welcome their savior: my people and me. "Save us, oh high and mighty alien beings! Teach us your ways of peace and harmony! Share your life-giving food, your cures for disease, and show us how to save our planet!"
Disillusioned, delirious from hunger, or deceived - all will come to me. And then Earth will be mine.