I agree to do this method as I did it too to get 55 mage for High Alch. I would suggest superheating Mithril ores for mithril bars but if you aren't a money spender, just superheat iron bars just like what I did :)
How long will it take for me to get 76 range in F2P(Currently I have 125k xp left to get 76 range)? Also, what monster would you suggest me to train on? Thanks!
You could try to range when your pking. I'm seeing a lot of people range in Bounty hunter worlds and it seems they are hitting quite high. But ranging may not always work.
The monsters that drop the skull scepter pieces are: Minotaurs, Flesh Crawlers, Catablepons and Ankous. Try to kill the weakest level of monsters you can find for fast kills and more likely skull scepter piece drops.
Going for armadyl won't be a fail however it will be harder than doing the bandos boss. You could try to go to armadyl for more money in the drops you get, but doing Bandos will get you the cash you want faster than armadyl. (I've seen a level 93 solo bandos so you should have little or no problem with the boss)
I would say it would cost around 2m-4m in my estimation. It'll probably cost more but I don't know the amount of chinchompas you will need. However, It will cost probably at the range I gave.
You can no longer see items that other people sell in the general store. You and ONLY you are able to see the items that you have sold to the general store.