questions about going to vegas sportsbooks for first time

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Only 3 MLB futures were up that I could find last week. Just about every sportsbook had the odds to win the World series and the odds to win the NL/AL pennant and odds for each division. I went to Vegas and was hoping to get a bet in on my Cubs, but someone beat me to them. Opening odds for winning the WS were 75:1, but had fallen to 8:1 by last week. 8:1 just wasn't enough for me to bet the Cubs.
Even the odds of 3:2 for the Cubs winning their division were pretty crappy. I couldn't find any MLB futures for over/under on number of games won.