Hi mate,
Its always best to go canvassing as well to make sure all is going the way you plan it, as a rule i dont let anyone canvass for me unless im there with them. I pay my canvassers £5 a lead but seeing as its your mates sister why not offer her half/1 clean value of what she picks up, to keep her keen i recomend to pay on the day which shows trust and so she will work harder for you and wont feel the need to risk throwing a few crap jobs onboard, like i always say best hours for canvassing are between 5 and 8pm.
As for commercial its a different game as i chase my own commercial not via canvassing but still worth a go if its shops/industrial you chase.
Hope it all plans out well for you, cant beat rapid growing through other peoples hard work.