Exchange Outbound connector for Sp 2013

Hello,

I have SP 2013 server in my local area. It's Ip address 10.0.0.1.  My real word Ip is  60.70.80.90 (example). I use nat for sp 2013 local Ip.

My internal domain is like abc.local,  email address is like abc.com.

I also have Exchange online. I want to configure outbound connector for sp 2013 server for email notifications. What is the configuration of outbound connector?

 Connector type: partner or on-premises?

Connection security: TLS, self signed or CA?

Outbound delivery: Mx or route?

Smart host ?

Domain?

Thankx...