In your application, you are able to directly designate the countries in which you'd like your Trademark to be protected. You can designate any number of countries as long as they're a member of the Madrid System. The registration for international Trademarks will last for 10 years and all associated fees are paid to the WIPO.
Like any nearly "perfect" system - the System has its flaws - namely that all nations globally are not a member of the Madrid Agreement. The benefits far outweigh the disadvantages by far. Even in the event you wish to register in a country singularly that is not included- you're able to file one application for many other countries in bulk.
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You should consider registering your mark in any country in which you currently offer your products or services under that mark. You should also consider filing in those countries where you intend to use the mark for your products or services in the future. The use of a mark is not a prerequisite for filing an application in most countries; however, some countries do have use requirements.
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