Planning on inlisting in the army in a couple months and want to join the Cargo Specialist unit (88H)?

Is there any one out there apart if this unit if so. what should i be studying more on so when i take the asvab i can get a score high enough to choose the job of my likeing. also what are the chances ill stay close to home? is it tru anythng on papper is what counts? what are things i should have down so when i do in to write my contract i can make sure every things i do will be to my advantage and not the government. . . .also is any one currently in the army and uses medical marijuana?