You should consider getting MUCH higher attack before meleeing any of the brothers. Mage them all, and range ahrim. Bring d scimmy for tunnels if you don't want to lrisk whip. What is your prayer lvl? If it is 43-50, I would say go with monkrobes+proselyte helm for higher mage bonus, or if it is higher than you can try mystic.
I would get rune first and wear rune pl8,legs,rune scimmy, and anti dragonfire shield.For inventory just bring food,probably a lot for you so bring a lot the first time then change depending on how much you use.
I would do whatever you want to do first, then lvl agility a LOT because it affects you in f2p. EDIT:if you want to impress your dad, then do quests and minigames to show him that the game is pure fun and you don't spend hours skilling.
I personally use about 8 lobbies each trip and I am a lower level than you. Also, you can get 1k lobbies for about 200k, that are already cooked. If you're trying to get cookign exp, then you can still get for less than 260k. You may have to buy in-game and not on forums, however.
I still personally think that this will result in the loss of many pouches. Why take 20 minutes to get more puches when you could take 2 minutes to get pouches back?
Here is a quote from the new update: I've never really runecrafted by the abyss myself,so correct me if I'm wrong,but doesn't this mean that people who drop their pouches right before they die to save them, will probably lose them now,since it will take a longer time to drop?
you can also wear the blue robes from canifis and go on world 99,there people give you 28 ess and you trade for 28 laws,no ess back.obviously its way slower because most people want their ess back.