definitely dont put stems in it. not even the smallest peice of one. it will totally poke a hole in it. put your shake in the middle of the wrap and like mold your weed into a cigar type shape by like rolling it around while its in the middle of the wrap. once its nicely shaped take one side of the wrap and tuck it under the weed and then begin rolling it by pulling up really firmly with your thumb and pushing down and slightly inward with your index and middle fingers. its important to start on the outsides of the blunt and work your way to the middle and then back to the outsides and then back to the middle and so on until you get nearly to the top. then while still holding the blunt in place with your thumb lick the top sticking out and seal that shit. if its misshapen or too loose take a peice of paper and roll the bunt in it like you did with the weed in the blunt and it will make it tighter. the best blunt i ever rolled was my first one. once you get it right it takes like 1 minute in to roll.
just keep practicing man