One short and simple method with eccommerce (don't need all 10k):
Buy 200 watches on alibaba.Find a seller that can whitelabel.Brand them with your name: for example Larry Igna watches.
Build 6-7 stores that sell only those watches.Price should be at least 20x. Let's say you paid $10/piece , sell for $220. Rank all stores in google for these keywords "Larry Igna watch" "Larry Igna collection" and so on.It should be easy, no more than 2 weeks, even if you're noob.
Make a Fb ads campaign for one store, where the price is $10 lower than anywere else.On landing page make it clear that's cheapest price.
Profit will come soon.
People searching for Larry Igna Watch will find only your stores.You could add some ebay and amazon to spice it up.
For this shouldn't spend more than 2k total, i would see profit in 1 month at 15k, depending on skills.
Ps. Don't make Larry Igna watches, please
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