Suspension Lift Questions

Long story short, I'm a fairly new owner to my Tundra and trucks in general. I came from a 5th gen 4runner. I did tons of off-roading mods to the 4runner so I will be doing the same to the Tundra. I have a few questions regarding lifts. I'm about ready to purchase suspension so I want to make sure get all the correct parts. Will be going with King's and possibly Icon RXT leafs. Still going back and forth on which UCA's I want. I'm a bit confused on shackles. Are they always needed even with upgraded leafs? And what would the ideal size or height recommendation be for them? What other parts would I need to complete the lift? Thanks.

 

Feel free to use as your avatar and good luck with your suspension adventure!! Welcome aboard sir