With the band of writing set to be the most challenging one, I feel almost agitated to crack it first. My approach is to take it slow but steady; two hours are allocated every day for 90 days, the first of which is devoted to reading while the second hour is mainly spent for the so-called 'hands-on' writing experience.
Attached is a document titled 100句英语帮你背7000单词, but I think it also sets a good example of sentence-structing.