Yes, but its pointless just having a cash pile/buying small parts of it. It's best to have the bandos and then just sell it when you'll have enough for extremes/turmoil
Your setup looks fine, as you get better you'll start using more prayer pots and less food for longer trips once you got your pray switching, but yeah this will just come with practice. Only other thing i can suggest is try and borrow a Sgs and use that, much better than a whip.