If you have never killed a dragon before I would suggest killing green dragons. They can be found east of clan wars in about lv 23 wild. They drop green dragon hides and dragon bones which together can be sold for about 7k, making them a pretty good way to earn money.
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There are not any lvl 29 dragons on runescape, dragons are levels 42 to 400.
Black Dragons are level 227.
Currently, Baby Green Dragons do not exist in the game.
every monster has a weakness, it depends which dragon search it up in runescape wiki
as far as i know there is no way to fight dragons as a non-mem then reagin slayer.