How do I go about querying for an American agent, if my book is written in Portuguese? Should I go after a bilingual agent or such a thing would probably be impossible to find?
Thank you again for you attention.
There are many bilingual agents (I myself speak Jawsanes of course) but generally we're not the ones doing the translating.
If you want to pitch your book to an American agent, you're going to need a book in English. Whether that means you translate it or someone else does is your call.
There are exceptions to this; sometimes the book is published in another language first, then it does well enough (sales or review wise) to garner the attention of an English language agent or editor.
** this would be funny if the damn translation was consistent.
It's supposed to be "I need an agent for a book" in Klingon.