Pool questions!

So it’s finally getting warmer here which means I’m already thinking about trips to the pool and I have a fever questions as a first time mom.

1. What floatie/floatation device would you recommend for a one year old? For example: puddle jumper, tube with a canopy, arm floaties.

2. Would you out baby in a long sleeve swim top when using an outdoor pool or is it okay to just lather her up in sunscreen? Also should she wear a hat?

3. Should we have some sort of arm or waist floatie on her when we are in the gradually declining water? Like the child play area/ankle deep water.

Thanks!