I do not travel much but have Silver Elite with Marriott due to signing up for their credit card. Will this get me an upgrade when staying at their locations? Also, will they offer the upgrade of do I need to ask? Is there a proper etiquette to this? Last question - I have a free night coupon from the credit card. Is there any chance to get an upgrade when I use this? Just a few questions from an infrequent traveler. Thanks for the help.

Charles