How to write academic english?
An essay in four parts, which may help you somewhat, can be found partly on Italki in four links.
How To Write A Good English PART 1 http://www.italki.com/entry/458624
How To Write A Good English PART 2 http://www.italki.com/entry/458625
How To Write A Good English PART 3 http://www.italki.com/entry/458629
How To Write A Good English PART 4 http://www.italki.com/entry/458630
That's not easy thing to do Wilhelmina. Most native speakers of English can't do that. It usually takes lots of years studying in a good university. I suggest you concentrate on becoming completely fluent before even thinking of taking on that challenge.
I do agree with Dorothy on this point, many English native speakers themselves, would find it quite of a struggle to write academically let alone a non-native speaker of the language, I would definitely suggest you to reprioritize your goals, work on improving your fluency first, then keep moving onward from that point.