2/ 1k is a healthy roll for stuff up to 8.8 imo, maybe sprinkle an occasional 11 in there. try get your ABI around 5-6.
3/ training sites, iv been on RIO and TPE, RIO is pretty pricey but great material, just trying CR now so will let you know
4/ vpip pfr, 3b/ fold to 3bet, steal, resteal, fold to resteal, cbet fold to cbet on each street, bb defend,
5/ I wrote some posts about this a while ago, probably a bit dated but i also made some videos,
my 1k post has a lot of information in it, 2 rather big tourney strategy posts on a lot of topics and about 5 videos i made with a friend reviewing HH,