1) Just go with the flow, your obviously attracted to him so just let your inner mojo go!
2)put your hand up his shirt, put your hand on the bottom of his back whilst your kissing, then if the kisses heat up move your hands round to the front, even if its just his waistline. Then if you feel more comfortable...you know where to move them to. It should be however you want it to be
3)Until your more experienced with him i think not using words is the key, for now body language and noises. Heavy breathing, little moans...sexy noises, not over the top porno noises but just 'hints' that your getting into it. Don't worry about talking dirty or anything like that for now, one step at a time