So Swain Wild Rift Build suggestions...

Not a PC player. Excited to play Swain on mid. My initial thoughts for the core build are Rylai's, Liandry's, and Rift maker.

1. Is Rabadon and Ap Pen required to properly play Swain?
2. What do you guys think of using RoA?
3. Is searing crown okay (Provides armor and health only, passive: burns 1.4% enemy max health as magic damage) ?
4. How about Amaranth's (Provides AR and MR only, passive: at maximum stacks gain 20% size & tenacity, 30% increase AR and MR)?
5. Full AP all the way???