As above. Barrows gloves are an unbelievable assistance, and give better melee AND ranged bonuses compared to the vambraces. Snakeskin boots for ranging are also a RS gold fantastic investment! Dragon boots really carry a negative range bonus, and as you're not likely to be struck at all, there's no point.
Guthan's is great, but in regards to optimizing slayer experience speed, I would opt for a whip. Also, get a rune defender asap- just takes about 2 hours, it is free, and really, very much worth the effort when it comes to low level tasks. Spend your remaining income on food (tuna if you're ranging, monkfish if melee), super sets and adequate bolts- mithril are probably the best until you're able to get your hands on broads.
Contemplate kitting out your POH using a prayer altar/mounted glory, Kharyll/Falador teleports, and a menagerie. This way, whilst teleporting into your house to visit Sumona, you can completely restore prayer, summoning, and also have access to a selection of teleports if you prefer your house.
For a word of advice for your levels, I would cancel metal dragon tasks, and use your slayer points to get the ability to fletch broad bolts and create black masks. Lastly, finish your first four tasks at a easier slayer master (eg. Canifis), as you are not going to be earning any issues before the fifth task. Fantastic luck!
OK so I would like to provide soloing that the armadyl boss a buy rs gold paypal go. I hope to get a wonderful drop (Does anyone know what the fall rate of a fantastic fall is?) The issue is that I must use welfare equipment, like I just have 3 mil to invest in equipment. I am only hoping for two, possibly 3 kills per excursion. If I could get more than that's just bonus.