Don’t feel bad for enjoying it, if he likes doing it then there isn’t a problem. He probably doesn’t ‘expect’ anything, but he’s probably curious as to why you haven’t. If you don’t feel comfortable doing something then you should talk to him about it. There’s no real ‘wrong’ way of giving hand/blow jobs, but there’s tons of websites with techniques on if you’re up for trying them. If your boyfriend likes/dislikes something you do, I’m sure he’ll let you know and you’ll tell from his reactions. I wouldn’t be worried though, just talk to him about it! :)
Here’s some links on hand/blowjob techniques:
http://datethedistrict.blogspot.co.uk/2011/02/how-to-give-great-handjob.html
http://www.howtodothings.com/family-relationships/how-to-give-a-handjob
http://www.cosmopolitan.com/sex-love/tips-moves/how-to-give-a-blow-job
http://www.sofeminine.co.uk/guide/relationships/f5975-oral-sex-for-him.html
~ Jade