PPPOE or hotspot, WPA-WPA2 or Ipsec ?

RouterOS Beginner Basics
1

Hello,

I want to cover a big area has 80 houses and some trees in between with a full wifi including :

  1. roaming users , means WDS or repeating “other options ?”
  2. security means ,WPA-WPA2 or something like Ipsec and the encryption decryption will happen in user and server parts not the routerboard WDS forwarders parts, right?
  3. accounting ofcourse coz not every one should login that easy, so hotspot or PPPOE is better here ? users are laptops no routerboard or ROS will be configured in client sides .
  4. speed should reach 40Mbps .

What are your recomindations !?

Thanks.