How do i get daedric set and dragon helmet? Can i make it myself?

Smithing.

Daedric is the less ambiguous of the two to find reagents to craft, seeing as you need daedric hearts.

GL

Smithing is the way to go to make both. I wear all daedric armour and dragon plate helmet it looks awesome You can find daedric hearts in vendors in most cities or certain quests, obviously you know how to get the dragon bones i hope lol

Both sets are craftable, as long as you have enabled the corresponding smithing perks. Check the smithing tree for more details.

if you want to make both than you'll want to move up the right side of the smithing tree and go through deadric to get dragon, that being said I wouldn't waste the perk in dragon if you have deadric unless you really think it looks that much better, because daedric is better armour and if you go through the heavy armour tree you;ll want to be wearing a matching set,