Officially multi-family starts at 6 units. That is where commercial underwriting rules apply, namely financing based on debt coverage based on property's income as opposed to personal finances or personal income.
So, a 6-plex in a rural area can be had for perhaps $200,000 .. and with say 20% down and an 80% CMHC mortgage you can start as low as $40,000 !
A 6-plex in Edmonton or Red Deer or Lower Mainland or any decent sized city in ON, MB or SK is about $400,000 (high 60's to low 70's/door minimum) .. and therefore 80-100K is required !
If you are handy and have guts you can find a motivated vendor which will give you a large VTB on his old ugly property with much deferred maintenance, and then maybe with 50K cash plus access to supplies and cheap labor (read: your own) it could be done for an 8-10 plex even !
A 20-plex in Edmonton would be about $1.6M to $2.2M .. and with 30% down minimum you'd need about 500-700K to continue there !
I'd certainly encourage you to get the course as it is great content, but like any training it is best applied soon after the theory. What good is it if one takes a course on driving, passes the theory portion but never get out on the road to drive soon thereafter ?
I bought my first 15 suiter in 2000 with 100K cash down (and some of that was my dad's) for $570,000. This property is now listed for sale for $1.6M (not by me, as I sold it for $750,000 in 2002) .. more examples on our website under "track record"