You can't you can only buy it.
no
It is impossible to make any dragon item or weapon with smithing except the dragon platebody and the dragon sq shield, and even that is combining rare drops to make the item. The only way to obain a dragon full helm is to either buy one in the grand exchange for a lot of money. Or kill Mithril Dragons which is a level 304 monster in the barbarian dungeon. It is a very rare drop.
to log to the dragon and kill it
It will make a lichen dragon
I don't know what the best armor is. The most expensive would be a full third age set. My favorite is a full dragon with dragon full helm, dragon boots, worn-out dragon gauntlets, oynox ring and neacklace or on of the full barrows sets. I really don't think there is a "best".
star dragon and metal dragon, but it can make an battery dragon too.
no kamodo dragon is more power full then a andaconda
The full breakdown of the groups for a Bearded Dragon are :-Domain:EukaryotaKingdom:AnimaliaPhylum:ChordataClass:ReptiliaOrder:SquamataSuborder:LacertiliaFamily:AgamidaeSubfamily:AgaminaeGenus:Pogona
No, level 128 ghosts that are in the RuneScape wilderness will not drop Dragon Full Helms. The only RuneScape monster that drops the Dragon Full Helm is the Mithril Dragon which has a combat level of 178 and drops the helm as a "very rare" drop.
Dark Dragon + Mud Dragon
earth dragon +eletrict dragon
The way you make your dragon sleep on dragon fable is all too simple.