And thanks for your advice to all. Even with OSRS gold prayer potions you are likely to profit from slayer as they are quite affordable. Based on the drops alone, there should be a profit. And if you don't have that then you can purchase Slayer Dart Runes from the master of slayers for 35 points to slayer (you get 36 for doing 2 tasks from Kuradel) costs you about 70k which is quite a bit and could add up to some decent cash if you invest your money in this instead of cancelling or blocking tasks.

Are bandits a good option to learn yet, or should i stick with Giant spiders at the strength of the hold till 70 def and then switch to bandits? Sumona needs 85 fight and smoking kills, that you must complete when you're a slayer.

Chaeldar requires either 70 or 80 combat (i am not sure) as well as access to Zanaris. Black Mask can be easily obtained from GE at a cost of a few hundred thousand. This is required for the Full Slayer Helm anyway so don't think its not worth it. You can buy the uncharged models. I'm not a slayer who prays during the slayer because I'm not an efficient slayer but maybe others know more.

Since ur f2pis a bow, u can't range elvarg, the dragon. F2P's only single-handed rng web is one of the weakest crossbows in the game. I would suggest around 40 or more atk, 40 or more str and 33 def or more prior to throwing it..

It is a risk to be killed since you aren't able to use an anti-drag sheild (unless you use bronze bolts on a reg crossbow) that's something i wouldn't advise. Maging it would be terrible since i've read that it has a powerful magic def. For the levels of the melee it will require an adamant armoury with a rune scimmy (40atk required), and full Adamant Armour (30 def required) or an amulet containing str and str potion can assist.. You will also require the anti drag sheild, because buy RS gold without it, Elvarg can hit upto 500 dmg.