Help with rb450 g and adsl wisp

Hi can some one please help. I am very lost with this router.
Ok here goes i am building a wisp with ubiquiti hardware i have 8 antennas starting with ip 192.168.1.11 to 192.168.1.19

I have an Adls router provided from my isp comtrend ar-5381u but this router will hang after about 10 to 15 connections

Note with Dhcp turned of and and ip of 192.168.1.1 (on comtrend) connected to 16 port switch my system works perfect as only have 6 people connected at the moment.

I was advised to get a rb450g to do the routing as it can handle alot more

I am a complete noob to networking and i would like to know the best way to connect the comtrend to the rb450g so the rb450g does all the routing I would like to keep my antennas on the network i have 192.168.1.11/192.168.1.19

Please i have been reading about 11 hours stright and im not getting any were.

Put the ADSL modem into bridge mode.

Add a PPPoE client on a router interface so that it dials out via the ADSL modem, use the add-default-route and use-peer-dns settings: http://wiki.mikrotik.com/wiki/Manual:Interface/PPPoE#PPPoE_Client

Assign your inside IP address to another router interface, that would probably be 192.168.1.1 or 192.168.1.254 - the IP that your modem currently has on its LAN port: http://wiki.mikrotik.com/wiki/Manual:IP/Address

If necessary add a DHCP server: http://wiki.mikrotik.com/wiki/Manual:IP/DHCP_Server

Hi ive been reading and reading stll dont get it.

Could you expain it like i was a 5 year old if poss excatly how to do it)

I know its alot to ask but this is the only thing from stoping my wisp business

Thanks for any help

Its ok i gotit thanks