Everything is on one page. Work down the sections in any order, skip what you don't know, then download a PDF or send it through. About 10–15 minutes. Nothing is binding until documents are signed.
Which agreement do you need?
Not sure? The short test: selling the company itself (its shares change hands, the company keeps its assets, debts and contracts) → Sale of Shares. Selling the business out of the entity (assets, goodwill and stock move to the buyer; the entity stays behind) → Sale of Business.