Potting training my 18 month old boy!

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My son has been VERY curious about the toilet. He puts down the lid and even flushes it for me when I go. He’s been pulling his little thing out and peeing in places of the house that I would really rather he didn’t pee😂. How do I start potty training him? He’s my first baby so even though I’m pregnant and know the answers to most things, with me having 6 siblings and all, I do not know where to start with the PT business. Help?!?!