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.
Choose the correct verb form for the following sentences. (help)
Is someone interesting to exchange language skills Portuguese, English and German?
How do I think of a starting sentence for my project?
Does anyone know the French translation of English NEGOTIATION Acronyms BATNA, WATNA, ZOPA, WAP, MLATNA?
Can someone help me in my Deutsch learning?
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