The kiosk are not the fastpass. There are several in both parks, at least four, but they move them around some so no sense telling you, they will tell you when you get there, where they are. They will be under a green umbrella and convenient to locations.
You will get your DSA card, sometimes they will let you pick a pass then other times they won't. Then your situation ASD and a kid dying to go on cars, I think works much much better in DL. Please bear with me, changing names of things and being blind I have a different way of speaking it, but if you pull up a map, I'm sure you will understand. So you go into DCA, you walk straight until the rotory and around it, going straight towards cars, right there at the entrance to the street forward, look to your right and you will see a kiosk they say the people have the plaid on and an umbrella in green. You walk up and ask if you can have a return time to RS (cars). They give you one, and then you take him to toy story, and go thru regular line, short in am so 15 minutes your done, do screaming no wait in am, and then do the carousel and ferries wheel. You are done back there and it only took you 45 minutes to an hour. Then walk back to RS and ride because your time is up. Walk back up the road and get a second pass to RS, it is right at the enterance of cars land you will have about an hour again. Go and do bugs land and everything else in cars land, and again ride RS. Walk to top of street again and get another pass the kiosk is at top of street under umbrella. I would add, that in am, if you have someone who can, I would have that person run over and get soaring FP after you get the pass for RS and before you head to toy story. Now you are ready to head onto soaring. Have someone run and get a fast pass to roaring river and walk past roaring river and do little mermaid, then the swings, goofy flight and the jets, I think there are little jelly jumpers also, none will have much of a line usually. Walk back and do roaring river. Then get changed. You spent 3 to 4 hours in park, did all the rides except ToT, get a fast pass for that and go to Aladdin show and ride ToT. Now go back out to the street with the rotary and get a pass for whatever you want in DL because in DL you can get passes in DCA for DL and reverse. Then have some lunch and go to DL.
Another way to do this, is when you stop in morning ask for a pass for toy story, then go to toy story and get on, ride once without your pass, then use you pass and ride a second time. A kiosk is outside across from toy story enterance, after you rode twice, stop and get a pass for RS, finish up all the rides in back and it will be time for you to head to RS, before you get on you can stop and get a fast pass for RS, ride it now, and get a pass to soaring or ToT, do bugs land until your fast pass for RS comes up, then do soaring.
Over at DL, at rope drop do SM but stop and get a pass for what you ASD person wants, let's say Splash. Do space mountain two or three times, because this is the one ride, I say if you don't do in morning forget it, 60 minute lines forever. If someone in party can walk over and get fast pass for like BTMR do so. After your done go to splash ride, on way back from splash, right around HM look for the umbrella kiosk, get a pass, then do pirates and Big Thunder. Use your pass for say HM. Now you are finished over here, as you come out of HM, get a pass for Indy, walk past Indy and get a fast pass for cruise, by now your Indy time may be ready. Ride Indy and then the cruise. As you walk out of adventure land, over near Main Street, look for the umbrella and get a pass for PP. now go do SW, Pinocchio, and toad ride, your pass should be up for PP. when you walk out, go towards dumbo, there will be an umbrella, get a pass for dumbo or for story book, then see how long the lines are for Casey, tea cups, carousel or Alice. Ride which ever ones are short. Soon use your dumbo pass and again as you get off dumbo get a pass for story book. Eat some lunch and story book time will be ready. Then get a pass back at dumbo for either Matterhorn and again, ride Alice or it's a small world. Then do your Matterhorn, walk back to dumbo and get a pass. Then head back tomorrow land. I would pick up FP where you can, and do
DAS pass in between.
To be honest, I find it so much easier at DL to use a DAS pass. First you don't have to walk up to the ride. Second if you start out early enough, you can ride everything in the morning with FP and DAS and be done around 1 in almost both parks. Leaving just one or two rides for later after you go back to hotel and take a nap and swim.
Hope that helped explain it for you. It sounds like a lot, but it is not. And there is very little wait, maybe 5 minutes if there is a lot of people in line ahead of you to get the pass. Other wise it is like WDW, if there is a 45 min line for space you will be giving a time 35 minutes later. It is on your plastic ticket card, so you need to have everyone's plastic ticket when you go ask for a DAS pass, but the person who has the DAS does not have to be there.