Just start with the basics;that is,making a ordinary sentence and day by day take a step further. I can suggest you Essential Grammer in Use [Raymond Murphy] third edition. I believe that it will be good start for you.
Basic English Grammar by Betty Azar is excellent. It's a large red book. It is the best in my opinion.
To use the modal verb 'must' when you talk about the past.
When do you use mich vs mir? Also why is it "Mir ist kalt" instead of "Ich bin kalt"?
Generating questions for collocations
What does "before it fades to black" mean?
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