Well I think you need to OSRS gold always train with slayer, it shouldn't take too much time to get 70 whatsoever; maybe a couple of days depending on the length of time you play every day. A excellent set-up for slayer that is fairly cheap is to use - Slayer Helm or even Neitznot (sp?) Helm until you receive the slayer helm, Amulet of Glory, Fighter Torso (can easily be obtained in a couple of hours), Torag's platelegs or Verac's Plateskirt if you'll be using prayer in your tasks as it provides prayer bonus, Whip /Dragon Scimitar, Dragon Defender, and Dragon Boots, along with Obsidian Cape (unless you have a firecape or skillcape).

Remember that is only a suggestion for gear, you always have the option to switch things up. For example, you may swap out of your defender to get an Obsidian shield should you feel like you need the additional defensive boost, and you could always use dragon plateleg's in case you don't need to be repairing your barrow's armor since it excels in battle.

Furthermore, if you don't have the pursuit requirements for your helms, then DO THEM. If you plan to do some slaying whatsoever you ought to do the Smoking Kills quest after possible. Do not be afraid to try different things and find out what works for you.

This whole setup will cost you roughly 2-2.5M, and is an superb general installation for slaying. Remember to also use some of that money to purchase super sets (Super Strength/Attack/Defence potions) that you ought to be using on ALL your slayer tasks. It might seem as if you're spending a lot at buy RuneScape Mobile gold first but it speeds your tasks up clearly and is well worth it, and you'll be profiting from your slayer drops / clue scrolls anyway.