Sheesh, does this have to start as a flamewar? At least he tried, and thats better then begging us if we can make a map.
Anyway, you wanted to know about teleporters, size, and thokbarriers?
Teleporters: First make a small sector with a certain tag number (forgot what it is. Try to look in the tutorial) Then place a teleport destination thing wherever you want. (Yes, its a thing)
Size: I suppose you mean sector size. Quite simple. Make a retangular sector, and drag the sectors lines straight up/right/left/down. The direction you drag the line to depends on where the line faces.
Thokbarriers: They're always confusing to most people. Well, I'll make a simple example. First you make a sector of any size. Then, you make a new sector that around the first one. That means its kinda a second line. The distance between the 2 lines shouldn't be too big. (Sorry, I hate to say linedefs) If you did it right, Sonic can't thok trough walls anymore.