That's because this game isn't finished yet. Basically this is a short walkthrough for all the missions available at the moment:
1. Beginning
You start in your own room, then you have to go to your sister's room. There will be a short dialogue. Then after that you go to the garden, fourth bush down on the left. It's a secret place. Another dialogue will take place. After that you are free to roam around and select missions.
2. Missions
There are several missions you can do. In the end the goal is to buy the camera roll from the general store and get the CGs. The roll costs $70 ingame.
several missions are:
-Babysitting
-Picking up on purpose dropped dollars by Lisa
-Testing a teleportation device
-Vibrating panties
-Capturing a rabbit
-Helping britney open the door.
-Something with a mouse (you have to capture it then give it to some girl)
-Tentacle plant
You can also choose to skip missions, just look for a spark near the mission. It will automatically skip the mission and give you 10 bucks.
3. Obtaining 1st set of CG's
After you obtained 70 bucks you can buy a camera roll from the general store.
You can give that roll to your neighbour girl (don't remember her name) then a mission will take place. In this mission you play that girl and you have to find Lisa 3 times. Then you will unlock pictures.
4. After 1st set of CG's
At this point you're almost done, since the game is still in development.
You can do the tentacle plant mission and complete it. AND you can locate an other mission in the house where you babysitted the boy earlier. There his mother is looking for him and is wondering if her neighbours have a machine to track him. It's not finished untill that point. You can get the goggles (obtained in the house to the right from where his mother is. Upstairs, room furthest to the left, to be exact), enter the yard and find the hidden cave. Then open your goggles and you will find a secret entrance. Nothing is there yet though.
There, don't make me answer annything mission-related now. XD