*Begins practicing concentrating stable chakra*
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It is.
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If you move at optimal pace for you given what Cupid told me, you'll take about four months.
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Correct. Once you're unable to continue that, it'll be the perfect time to begin sage training. Continuing back and forth between the two works well.
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There's a lot of training. First, you need to get your body to a point where it can handle it. Then, you need to learn correct meditation to pull in natural energy. Finally, you need to learn to combine natural energy with your chakra. This will take a while, so it should be done in conjunction with you practicing chidori and rasengan.
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Increases in every attribute, the ability to use new techniques, and the ability to fight against things that are immune to ninjutsu.
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Sage chakra. It's difficult, but shadow clones make it easier.
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It is. But that will be the final stage of this. Everything in order.
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You'll have so much chakra you won't know how to run out.