Definitely no on going to Armadyl GW; you can only range/mage Kree'arra. Both skills of yours are quite low. :/
You could try SGW, BGW, or ZGW though. You can already do BGW and ZGW; SGW requires 70 Agility, but yields a LOT more money with hilt drops, etc.
There are tons of youtube guides for them, but as for basics:
BGW:
Use protect/range when not being directly attacked by the general here. He hits 35 max with Range and 65ish max with Melee. His range attack hits every player in the area, and melee only hits one. It is suggested you go with a team of 3-4 for a good reward [cs or ls] when he gives you a good drop. His 3 sergs can also drop Bandos armour.
ZGS:
Use protect/melee when he's attacking you, and BRING SUPER ANTIPOISONS. He has a chance of poisoning you for 16's. He maxes in the mid 50's, and his attacks are stronger (but far less accurate) when you're using prayer. You can pray against his sergs if you want. He drops the ZGS hilt and Z Spear. Bring 3-4 people to help out for a good reward (5M+) on a hilt drop.
SGW:
Second hardest GW; no experience with it, so you'll need to check YT for it. It requires 70 agil and 3-5 other people. You get 10M+ per hilt drop, though.
AGW:
Hardest GW because Kree'arra uses range and melee attacks, along with pushing you away with gusts of wind. You can only hit it with range/mage, and can expect to die QUICKLY if you go in with mage robes on.
. Bring full torag's + Armadyl/Black d'hide/Karil's top. Inventory has to be super restores and brews because you get damaged quickly. Bring 3-6 others for 10M+ per hilt drop and 2m+ per armour drop (minus the helm, ofc).
Good luck!
~Macro_FTW
Current Project: Catching up. XD. Potentially back for the summer, depending on how things go.