"there were 1,000 vines." That is, when Isaiah wrote, there were vineyards, in some of which were 1,000 vines or more each. He says that these vineyards will become full of briers and thorns. (See: [[rc://en/ta/man/translate/translate-numbers]])
"1000 silver shekels." A shekel is a silver coin worth 4 days wage. Alternate translation: "1,000 silver coins" (See: [[rc://en/ta/man/translate/translate-numbers]] and [[rc://en/ta/man/translate/translate-bmoney]])
The words "briers" and "thorns" both refer to useless, thorny plants. It is not necessary to translate both words. Alternate translation: "thorn bushes" or "brier bushes" (See: [[rc://en/ta/man/translate/figs-doublet]])