If your network infrastructure is already in place and working, except for the multiple PPPoE accounts, then you don't need to get a MikroTik router with WiFi capabilities!
All you really need to do is to change the default gateway IP address from your ADSL modem to the MikroTik router's IP address. By doing that, the PC's & laptops would send their packets to the MikroTik router if they want to access something on the Internet, instead of sending the packets to the ADSL modem.
eg. If you currently have an ADSL modem with 5 LAN ports:
ADSL port) to Telkom ADSL line
LAN port #1) to WiFi AP #1
LAN port #2) to WiFi AP #2
LAN port #3) to Desktop PC
Then I'd recommend that you connect the LAN ports #4 & #5 of the ADSL modem to like LAN ports #1 & #2 on the MikroTik, where #1 will act as the LAN interface and #2 as the WAN interface.
It's not necessary to make 2 connections from the ADSL modem to the MikroTik router, but it makes traffic monitoring much easier if you do.
Before you connect the MikroTik router like that, I would recommend that you first set it up completely separate, with just like 1 LAN cable connected to your PC/laptop.
After you've finished configuring the MikroTik router, you should disable DHCP on your WiFi AP's & ADSL modem.
So the configuration of the MikroTik would entail that you set it up as:
1) Your primary DHCP server (for handing out IP addresses), and add static IP addresses OR you'll have to run multiple DHCP networks (eg. a different one for each WiFi AP)
2) Give it a LAN IP address, so that your ADSL router, WiFi AP's, PC's & laptops can connect to it
3) Create 2 PPPoE connections to connect via it's WAN interface. You don't need to assign an IP address to the WAN interface, since the PPPoE connections would get their own IP addresses.
4) Set up Policy Based Routing (it should be fairly easy to find MikroTik tutorials on this)
If you want your WiFi AP's to be separated, then you can connect them directly on the MikroTik router, so that you can place them in VLAN's or just assign different IP ranges to the 2 WiFi AP's clients.
So ja, could you perhaps draw up or describe your network layout in detail?
Please try and include the following detail:
1) How all the devices are connected
2) Add brand & model of routers + WiFi AP's
3) Add the IP addresses of the routers + WiFI AP's, as well as the IP addresses that their DHCP servers assign
Microsoft Visio is pretty awesome for drawing network diagrams. Otherwise use mspaint
