Once you have identified the main points for your speech you can start organizing it.  You can use the models of organization which I will tell bellow:

Topical

Spatial

Problem /solution

Cause/effect

The motivated sequence is another method of organization that might be useful for your speech

The motivated sequence it’s based on the listed below

Gain attention

Establish the need or problem

Satisfy the need or problem

Demonstrate the benefits of your thesis

Ask for action