There are different types of dragons now. You dont need any strength level to kill them. You could have heaps of food and hit rapid 1's and 2's with 1 strength. You can also use Magic or Ranged which required no strength.
you wold have to be at least level 71-80
his name is evlarg but his level is 83
yah i kill it when i had 40 def 50 str and lvl 44
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.
You can do dragon slayer at any level, but I'd suggest getting higher strength and attack if you are going to fight it with melee and if you have not already, get your combat level to 40 or so.
A bronze dragon's combat level is 124.
Bandos, considering it's high defense level along with Strength bonus, it is even considered better than Dragon Platebody.
The only f2p dragon is the one from the quest "dragon slayer".
Mithril Dragon's are level 304, and are not to be taken lightly.
the kbd is something over level 500
I would train a little bit more until you are around level 50, before you start doing that quest, train your strength and defence up.
There are not any lvl 29 dragons on runescape, dragons are levels 42 to 400.