There is no minimum investment. The designated entities usually select tech related companies. IRCC is now processing April 2020 applications so about 2 years at the moment.
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What are the requirements for the Start-up Visa program in Canada?
How much do I need to invest and can I launch my own company in any industry? How long does it take to get approved with the backlog in Canada?
English or French, level 5 out of 12 is required. There is no specific amount of money required for investment, the key is "genuine investment in a genuine start-up". Time frames are officially at 31 months between file submission and PR visas, but if you get a Letter Of Support (LOS) from a designated organization with a good reputation, if your project is clearly genuine, your application may be processed quicker.