As somebody with a large record collection (2000 or so) and a large comic collection here's what I'd suggest.
1) check out and talk to owners of record stores..... look for stores that sell classical vinyl.
http://www.blogto.com/toronto/the_best_vinyl_record_stores_in_toronto/
2) there are record shows that come through toronto a few times a year and other cities in southern ontario where vendors rent out a banquet hall and ply their wares.
3) kijiji and craigslist
4) ebay
There are two strategies...... sell bulk at a low price per record or try and sell them individually at market value.
What's your time worth to you?
Shipping vinyl will eat profits very quickly.
I sold my entire comic colleciton and had to break it up into individual title sets and probably sold them at about $1 and issue. Still made a few thousand over a few months. Now sure I could have made much more money if I wanted to wait for the right buyer who's willing to pay top dollar but that could take years.
I know I haven't offered much in terms of new information but my big advice is unless you are wiling to put a lot of time and effort into this endeavour erase all thoughts of big money.
Even at the record shows you can haggle and find good deals. The market is geared towards lowballers unless you have a lot of patience or have truly rare/valuable stuff.
Value Village and other thrift stores used to be filled with old classical vinyl when everyone was cleaning out their closets. Now not so much.