15 including flint and steel
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A portal to the Nether requires ten Obsidian blocks (eco version) or fourteen Obsidian blocks for the full version.
To find glowstone, you must first travel to the nether; an alternate realm where many different blocks can be found. To get to the nether, you must first create a nether portal.
In order to to the nether you need a portal.
The nether portal should be 5 blocks high, and 4 blocks wide. Building the portal should leave a 3x2 space in the middle. You could also take out the obsidian in the corners. The portal will still work. Then, light the 3x2 space with flint and steel. If the portal goes up in flames, then that means you didn't do it right. If the middle turns purple, then you did it right.
A Nether portal is an obsidian structure that can transport players to or from the Nether dimension. USB doesn't come into it anywhere. The 'Minecraft USB nether portal' is just a YouTube fake.