Just start with the basics;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.
Practice and practice, start with simple sentences and gradually make then more complx, adding, expression or quiantifers or prepositions, use a topc which you're easily related to, read about topics that you like and practice more . you'll see the improvement!
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