I do not know what to say

I do not know how to construct sentences in English.
Actually, I do not know anything or where to start
Can someone to help me?

Você parece estar indo bem. Temos muitas semelhanças entre nossas línguas.

I do not know what to say

I do not know to construct sentences in English.  Actually, I do not know anything or where to start
Can someone to help me?

You have already started :)  Just write your heart out.  Don't worry about mistakes.  If you don't have any idea, write in Portuguese and translate into English as best as you can.  We will do the rest.  You can learn from our corrections.