Who supervised the erection of the Tabernacle for the first time?

Moses supervised the building and then anointed it per God’s instructions.

Source: Exodus 40:1-11

What was the weight of the Gold and Silver donated for the Tabernacle based on?

The weight was the Shekel of the Sanctuary. This is 0.4 oz or 11.4 grams. A talent was three thousand shekels.

Source: Exodus 38:24-27

Did Bezaleel do all the work himself or did he have help?

Bezaleel was assisted by Oholiab and many other workmen.

Source: Exodus 36:1-3

Who was the lead worker on building the Tabernacle?

Bezaleel of the tribe of Judah was the lead worker on the Tabernacle.

Source: Exodus 31:2

How were the materials obtained to build the Tabernacle?

The Israelites gave a free will offering of all the materials needed.

Source: Exodus 25:2-7 Exodus 25:21-29