There are 13 choices for Fastpass+ experiences at Hollywood Studios and this is another 2 tier park.
Tier 1-CHOOSE ONE
Beauty and the Beast- Live on Stage- I don't think a Fastpass+ is necessary here.
Fantasmic! I wouldn't use your Fastpass+ here either, I think the Fantasmic Dinner Package is a good idea though. (this will guarantee you seating) The Fastpass+ does not save your seat there or give you a better spot. Just get to the show a little early and you will be fine.
Rock 'n' Roller Coaster- I hate that Toy Story Mania and this ride are in the same tier because I love both. The line for Toy Story Mania is usually longer though, so I would still choose it. Just try and get there early for this ride. This is a major thrill seeker so obviously if you have small children Toy Story is a no brainer.
Toy Story Mania!-USE YOUR FASTPASS HERE! I LOVE this ride and it is for ALL AGES! The line is always so long here!
The Great Movie Ride-This one is a good one to use your Fastpass+ choice for.
Tier 2- CHOOSE TWO
Disney Junior- Live on Stage!-This gets you at the front of the room which is not a very good spot, and a Fastpass+ is just not necessary.
Indiana Jones Epic Stunt Spectacular-The pre-show here is actually pretty fun, so I wouldn't use one here!
Lights, Motors, Action! Extreme Stunt Show-Not necessary here either, just arrive about 30 minutes early.
Muppet*Vision 3D-There are rarely long lines here, a Fastpass+ is not necessary.
Star Tours: The Adventures Continue-This would be a good one to fill your 3 spots as the lines can get quite long.
The American Idol Experience-NEVER NEVER NEVER!
The Twilight Zone Tower of Terror-Definitely use a Fastpass+ selection here, I love this ride! Keep in mind that it is a thrilling ride so if you don't have thrill seekers on your list, you may want to choose something else.
Voyage of the Little Mermaid-This one isn't crucial but if you are looking for something to fill your spot, it isn't a bad idea!
That is all! Good luck!