Your accounts don't need to be complicated. Set them up so they look like a real person, warm them up for an hour, and start posting. Here's the whole thing.
Before you post, act like your ideal viewer. Go to the search bar and search what they'd search. If it's a dog product, search dog videos. Like, favorite, and comment on 10 to 20 of them for about 5 to 10 minutes. Do it on all three platforms.
Then let the accounts sit for 30 minutes to an hour before you post anything. Use that time to make videos, because you want 5 to 10 ready before you drop a product.
Real-looking profiles, warmed up, videos in the tank.
Next lesson: the posting system that gets them seen.