All starts with the proper study and you need to learn basics, before you getting started.

To answer, how to start trade of chemicals, then here are many important questions what must be clear advance, like to where you are going to export?
From where you are going to buy the products? 
Those will determine lots of requrements what u need to know before u getting started.

Also, you need to know what kinds of chemical exactly you are going to trade.

Also, trading the chemicals, it is an volume business, which means, that the quantities what you are trading are huge. This means normally that you need lot of free cash.

If you dont have lot of free cash, then you can start as an import-export agent. Which i believe is an better way for you.

So, first you need to figure out the following basic questions:
1. To what country you are going to export and from where to import from.
2. What exactly are the products ( what type Chemicals) what you are going to trade.
3. How to find the buyers ( customers)?
4. How much free money you have for this business?

After previous three are clear, then its easier to go further.

I would suggest, join e-course. I can teach you all what you need to know. I am aexperienced in import-export business between Europe and third countries.

PS! Here is the good news for People who wish to start export/import business!

I am Creating online course where students will find all the helpful resources and step by step study-materials how to get started in Import export business with Europe nowadays, from Scratch!

This online course will be updated regularly, so students can get new and actional material regularly!