Hi Marco,
Generally it's best to start selling something you are interested in because you are going to be spending a lot of time thinking about it. Also it's likely that there are plenty of other people who also share your interest - giving you an instant audience for your product.
Below are a couple of posts that might give you some ideas:
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If you do wish to stick with watches, handbags, and lingerie, then here are some of our best sources for those items:
Handbags
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Watches
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Lingerie
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These are suppliers for authentic brand-name products as well as suppliers of generic brands. Some of them are drop shippers, some are wholesalers who may be willing to drop ship upon request. All of them offer worldwide shipment. Let us know if you need any more supplier suggestions and we'll be happy to help. All the best!