Welcome to CRT!
First off, I strongly recommend you get a VIP membership here on CRT. The discounts will help pay for the cost of membership on your first trip. You'll also have access to the VIP section, which includes printable maps, a list of more local spots, etc.
Taxi fare from Sabana Norte to the Sportsmen's will be around $12.00 depending on traffic/route. This is a guess on my part, based on a restaurant run out there a couple years ago, so take it for what it's worth. I'm certain that a local resident like Irish Drifter will comment if this estimate is wrong.
Yes, local massage parlors will be friendly to your U.S. or Canadian dollars, although not all offer sex. There are a number of good MPs on Paseo Colon which in fact, do offer sex. Check out the "Tico Bar and Massage Parlor List" elsewhere on this forum.
Best places to watch NFL include the Sportsmen's and the Hotel Del Rey/Blue Marlin bar. You can legally bet at the latter. Ambience and fellowship are better at the former.
Look for the friendly blind guy with the neatly-cut brown hair and the long white stick. Oh yeah, I have a blind cane too.

I'll be happy to interpret for you or whatever. Welcome aboard.