2 acres. Where to begin?

My husband and I just bought a home on two acres. The previous owners had it sprayed with pesticides. I don’t know what kind of pesticide was used.

I’m wondering… about how long does it take to fade away? One of the first things I wanted to do in the yard was add a pollinator garden. But I don’t want to do that if there are remnants of poison. For someone in my position, with a yard that’s been sprayed, where is the best place to start when incorporating permaculture practices?

Some info on our property : We’re in central NC. No HOA. The two acres is fairly open – with a few scattered pine trees. Surrounding land is heavily wooded. The septic drain field is in the middle of the yard. There’s a slight downward slope towards the back of the property.

I’m so excited to get started!!! And I hope to see evidence of the pesticide fading away very quickly. There are dead pollinators everywhere. 🙁