When using points they are 1,000 points for every dollar you redeem.
But be aware that every dollar you redeem does not count towards coupons that have a minimum purchase. Stacking coupons is not always the issue when a deal is not kicking in at the register; not spending the minimum $10 or $30 for certain offers will prevent them from kicking in. (i.e. you have $50 in points; you are buying a $47 item; you can only use $17 (17k) in points so that you SPEND $30 to use a coupon with a $30 spend minimum OR use only $37 (37k) points so you SPEND the $10 minimum for that coupon.)
Some expire before others.
You may want to use the big one first and save the smaller one if you know you will be back soon.
Looking at THIS from another angle, the points come off the item cost pre-tax so your points don't get gobbled up by taxes which vary by locality. SO USE YOUR POINTS FOR FULLY TAXABLE ITEMS INSTEAD OF UN-TAXED FOOD OR HALF-TAXED CLOTHING TO REALIZE THE MAXIMUM VALUE OF YOUR POINTS.