So what determines a stocks price is what all the stocks of that company add up to in a whole. And the willingness of buyers / sellers are willing to bid / ask that drives the price?

Yes, that's correct. The price of a stock is determined by the total value of all the outstanding shares of that company. The bid price is the highest price a buyer is willing to pay for a share, while the ask price is the lowest price a seller is willing to sell a share. The difference between the bid and ask prices is called the bid-ask spread. The wider the spread, the less liquid the stock is.