Hello there and welcome!
Firstly, it depends how much money you have. A simple way to make some starting money is by going to ::thieve. Once you have got enough money, I would suggest buying a whip. I would then recommend you buy either of the following depending on leftover money:
- Food and potions from rasalo (Edge general store)
- Bandos boots (Cheap) Dragon boots (5m)
- Glory (Cheap) Fury (7m)
- Ring of wealth (50k) Just to slightly help with rare drop table items
For gloves, I'd recommend you do recipe for disaster quest, granting you with barrows gloves.
For armour, I'd recommend that you spend a couple hours at pest control, collecting void (melee) so you can start using it with slayer. Otherwise, get rune armour and go to ::barrows and try your luck at getting some armour, if you get pieces you don't want you can even sell it for money! If you want a slayer helm, I'd recommend you killing cave horror's, as I don't think you'll have enough money saved over from thieve.
For guides, type ::guides in game or find the 'Guides' section on the forums. Under MISC guides, their is a guide that lists every guide, giving you a quick fast shortcut to any guide you may need.
If you need any further help, either PM me or join 'Help' CC.