Please Help me about 2 Load Balance and Forward Port

I’m a beginner of mikrotik.

I want to set up my new network.

How I can have to set up my network?

Please help and describe me step by step.

Thanks.
Main-Network.jpg

For this config, and as you will probably be supporting this going forward, I think it is best to go do the Mikrotik training / certifications, or pay a Mikrotik consultant