Advantage is to be "on the button" -- the player furthest from the action. That is, with each cycle around the table, the blinds are first to act and the button is last. This is highly advantageous because the person last to act has seen a suggestion of each other player's interest in the pot (subject, of course, to bluffing and slow play).
Blind raising is dependent on where you're playing. In a tournament they typically get raised every 15 or 20 minutes -- a necessary action to ensure the tourney doesn't go on forever. In standard cash table games, the table has a fixed blind (but you can go play at other tables with different blinds).
It's foolish to fold if you have the option of checking. People sometimes do it without thinking though.
KKQ7x beats KKQ6y (where x is below 7, y is below 6, and there are no flushes in play).
When to check or fold takes far more explanation than a simple stack exchange question can address. There are literally volumes and volumes of books that attempt to answer that, but one issue to consider: boredom. I don't think you're going to enjoy poker playing the way you suggest.
