I have a couple of questions. First of all, I read the hint section and..

You need to link up with someone to unlock moon base zeta. Afterwards, when you visit the phone booth, it'll look like a spider thing and when you enter it'll go underground and take you there. The Ninja appears by the bed in that area but I forget what time. You give the map to the sleeping guy in the school when you get that mission. I think you need all the points for a certain rep group to get into a clubhouse. I dunno how to get all the points though. Sorry.

If you link gameboys with some one else to unlock it the Ninja will be there between 10:00am and 11:00am(you can find the Ninja at: Nov. 29, 1984 between 1:00am and 2:00 am-after finishing level five between 2:00am and 3:00=carnival between 4:00am and 5:00am=paradise island-on the one with the hammock, need fan boat to get there between 6:00am and 7:00am=secret tunnel between jail and dark tree)

You need 10 rep points of your group to get into that groups clubhouse.
Here are the things to get the ten points:
+1 for each of the four group members with a score 50 and up (Nerdie:Lincoln Broadstreet, Max Moore, Polly Nomial(King/Queen), and Sue Prinova Artsie:Cannonball Coleman, Pritchard Locksley, Roxanna Moxie(King/Queen), and Theresa Bullhorn Streetie:Crystal, Darius(King/Queen), Ewan Watahmee, and Kris Thistle Richie: Lily Gates, Lottie Cash, Luthor L. Bigbucks(King/Queen), and Misty Waters)
+1 for having all of groups favorite skill (Nerdie:Logic Artsie:Creativity Streetie:Body Richie:Charisma)
+1 top relationship with King/Queen(see above for list of Kings and Queens)
+1 for negitive relationship with nemisis King/Queen(Nerdie vs. Artsie Streetie vs. Richie)
+1 for finding and returning groups trophie(Nerdie:in tree just outside ans to the left of the front gate to the carnival Artsie:in the bayou behind the two man eating plants Streetie:in the graveyard on the path to the mausoleum entrance-somewhere in the wall directly between mausoleum and other entrance Richie:in the Glasstown megamall on the second floor between the water heaters and the computers)
+2 for completing groups mission
Rewards for YOUR Rep Group
+1 silver plaque (hung on wall or sell)
+2 subscription to magazine (sell)
+3 Rep mission (do NOT sell any trash piles or you'll never complete Artsie goals)
+4 all members greet your urb with a special gesture
+5 special bumper boat for Yar Hey! Bombard minigame
+6 Rep object (Nerdie:Mad Skillz Cerebral Data Infuser-I do NOT recomend selling, it gives free skill points, can only use once a day Artsie:Bod-Mod Booth Streetie:MP-DEE Stereo System Richie:Sensory Deprivation Chamber-I do NOT recomend selling this either, it fills all your needs; sleep, hunger, hygeine, etc.)
+7 gold plaque (hang on wall or sell)
+8 groups Rep Xizzle (Nerdie:Spelling Bee minigame Artsie:Djinn Genius-genie lamp arrives in the mail-extra living space Streetie:Street Signs Richie:Gratis, Baby-400 simoleons come in the mail weekly)
+9 urb does group signature walk
+10 gets clubhous keys (can be sold and still allowed in clubhouse)
+4 in any other group unlock rep mission
+10 in any other group Rep King/Queen will ask if you want to join their group
FOR EACH REWARD YOU MUST TALK TO THE KING/QUEEN!!!