help a newbee please

hi all i am new to the Forums and new at having a quad..:sad
Anyway i bought a used 2006 honda rancher trx400fga from a friend that needs work..it sat for 2 years without use..it would not start i took off the carb and cleaned it got it running not new idles little high..anyway i tried to put the shifter into drive and reverse it just grinds and won't go in to gear ..like i said im new to quads and stupid with them as you hear..Question is there a clutch on it when putting in gear on the main shifter? Also missing the brake cable on the left side of the handle bar when shitting on the quad..i ordered one and don't know where it goes? if you understand what i saying please help..i looked on the internet could not find and info i need
thanks all sorry for my stupid questions:crying