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We use ago in counting from the time of speaking to a point in the past; half an hour ago, three days ago, four months ago, five years ago, a long time ago. We use before in counting from a distant to a nearer point in the past. Napoleon died in 1821, he had lost the battle of Waterloo six years before.
When we use ago, the verb is always in the simple past tense: He came five minutes ago.
We can't use not so in the sense of not very. The expression He's not so rich implies a comparison: He's not so rich as you are.
Use very with adjectives and adverbs in the positive, and with present participles used as adjectives like interesting. Use much with comparatives.
If we are speaking of a near and immediate future time, we must use presently, immediately, in a minute, or soon. Just now refers to present past time, and not to future time: He's not at home just now (= at this moment). He left just now (= a little time ago).