the first two metal gears are available in English in the HD collection version of MGS3 (PS3, XBox360 or PS Vita).
The first metal gear available on the NES has not much to do with the real first metal gear game, Hideo Kojima was not really involved in that adaptation for the NES, so it isn't considered canon or anything.
If I had to pick a platform for the full experience, that'd be the PS3 and the Legacy Collection bundle, which also includes MGS4 (physical BDD) and MGS1 as a digital download, I'm not sure if it's still available, but when it was, it was a great bundle.
The first metal gear available on the NES has not much to do with the real first metal gear game, Hideo Kojima was not really involved in that adaptation for the NES, so it isn't considered canon or anything.
If I had to pick a platform for the full experience, that'd be the PS3 and the Legacy Collection bundle, which also includes MGS4 (physical BDD) and MGS1 as a digital download, I'm not sure if it's still available, but when it was, it was a great bundle.