I would love to give my husband oral sex but i dont have a clue how to start

well, first of all...open your mouth....:-), just kidding :-)
You could start kissing him and slowly go down, while playing with his toy. Keep on kissing him on his chest, belly, he will wanting you to go down much further. Kiss his penis, lick the head like you are licking an icecream, put your wet lips on the shaft, and go up and down. Start licking the head again, and then put your lipps on it. Open your mouth and let it slide in, with some suction. Move your head up and down, like he is fucking your mouth, play with your tongue, but don't suck to hard, it's not always a nice feeling, unless he's cumming...bite him a little bit (not too hard!!!!), play with his balls while you suck him, try to play with his ass too, see what he likes...
and most of all....try to enjoy it too :-) !!
Have fun !!!