CENTOS 6 enable sendmail on my VPS server

Hi linux specialists. I've got a CENTOS VPS which I cannot figure out how to make "sendmail" works. I've installed Sendmail + Dovecot and opened the port 25 & 993 in my ipTables. I use Cloudflare DNS and need to configure MX records properly there. I want to enable the function of Sending & Receiving emails on my server and know how to configure different emails for my different domains. Can you provide tutorial + 1hour live assistance with this please? (As I will not give access to SSH) Thanks. Please don't show me your past works, i don't care, I just need someone professional who can assist me clearly in this matter.