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The MGC V1 is a great cube, you can really just keep using it until you reach ~sub-15 maybe, but of course, it will have been worn out by then. Beginner's Method should be able to get you to around sub-50, then you should start learning CFOP F2L and 4-look-last-layer.
Do you have any specific questions? There are a lot of good threads on the forum here if you search around, and Youtube has tons of good videos. Moving from beginner method to a more advanced method would be a step in the right direction.