And do EVERY job, Take your time, gather drops, Dont cannon, Keep all of drops, You can try Shilo but should you find it hard, Do chealdar for OSRS gold a little while and most importantly have fun doing this, Dont over do it by try to stay consistent with your slaying. You will find a handful of AMAZING slayer guides on the market in case you look for them which will give you a better perspective on the best way to train it. But figured id give you my advice.
I will need to disagree with a few people here. I am 80 slay, and I find the cannon useful. It really is total taste, but it really helps accelerate some slower jobs and helps you get a couple of range levels in easily. It does cost a fantastic bit of cash, but you are going to be earning so much gain with different tasks it will not even matter. I cannon powerful banshees, cave crawlers (lvl 138 ones), and aberrant specters. All three of them drop many rannars, powerful banshees also drop a lot of pure essence, and that means you make back around 1/2 into 3/4 of everything you invest on cannonballs. I recommend doing realm farming and management rannars or snapdragons while slaying anyways, so that cancels any loss.
Its really not as expensive as people make it out to be if you are selective about what tasks you use it on. Also a lot of people cannon bloodveld jobs at mutated bloodvelds, but that I haven't did Legacy of Seergaze therefore that I cannot. On the note of the DFS, I find the rune defender to be better seeing as the +19 (I believe ) to attack really helps more than 2 more strength incentive, unless you are on a really hard-hitting endeavor or a dragon task of course. Of course once again it is preference and will not make much difference, and you may need the extra defense with no bunyip.
On that note, get a bunyip when possible, It's amazing while slaying almost cutting the need for meals. I use it with the enchanted excalibur from Old School RuneScape Gold seers hard achievement diary, and I don't require food for most tasks. Obviously you don't have enough now, simply save up and gradually enhance your gear. At this time I still don't have bandos, but I utilize fighter chest with torags legs as a good substitute.