You can go into the wilderness and fight dragons, don't forget the dragon-fire shield, but be careful of revenants they can still kill you easy.
You should fight experiments if you want exp or baby red drags with prayer potions and protect from melee. If you wanna fight for fun and max go to baby blue dragons.
You find them in the wilderness! just go up from the fist of guthix
no both are solitary.and can fight.
go to the bottom and fight the monster
No because non members cannot go into the area were you find green dragons.
train on barbs till lvl 60 than go down the hole to the second level with food and fight monsters until 90 than fight green dragons there are green dragons for non members they are north of the monastery only go there with an anti dragon breath shield, rune sword or better and the rest of your armour only cheap armour like addynothing to expensive cause you might die
you can go to crash site and fight the two bosses.Or you can go to vasalkars lair and fight the red dragon or just the normal dragons there.
If you want to go on an adventure I'd recommend trying some quests, they will have you slaying dragons venturing to far away lands and saving princesses in no time ;).
You find experiments while doing the Creature of Frekenstrain quest. There is a portion where you are asked to go underground, and you will find experiments there.
if you are talking about combat of giants dragons then you go up to the dragon and touch it and fight it by using your stylus to slide forward causing a head attack and soon you'll be able to fly, and evade in battles too.
The best spot on Runescape Train Attack is in between lumby and vorok, go to beefy bill, or in al kirid fight guards with friends.