Hi Antonella,
The key thing is to have a shopping cart that will allow you to facilitate shipping from various locations for a single customer.
Also, you can openly add in your descriptions your products country of origin that way your customer will know where the products are coming from and will also know what to expect - that they may be receiving separate packages instead of 1 consolidated order. Remember there is no need to hide the fact that you are using multiple dropshippers (for your suppliers).
You might find the following posts helpful -
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Hope this helps! All the best :)
(By the way, love your name ;))