"A young Mission at th beginning of the Missionary work- the beginning or its ...
Located in the Northeastern Zone of Peru with dynamic, happy and friendly people, that is Northeastern Mission.- I'd change the word order- The Northeatern Mission is located...
Up to now, it counts- I'd use 'now'
Eight-two thousand, two hundred and Seventy-four- I'd write this as a number 82,274 (also you use capital letter here a bit randomly)
fruit os- typo 'of'
which attends different people with appropriate strategies to each one of them.- which is attended by different people, each with appropriate strategies (however, I'm not too sure what you mean by this- also, I'd join this on to the previous paragraph)
Adventist Youth had carried- delete had
maintaining of our youth- maintain (do you mean numbers of young people? If so, say youth numbers)
Northeastern Mission - Northeastern Mission, set up the first..
City, this - City. This was set up...
purpose of strengthen- aim of stengthening
whom exchanged - who
Due to this the weekend was made a milestone- This weekend was a milestone
Pastor Melchor Ferreyra was the main orator at the Camp, who is President of Adventist Church in Peru.. Pastor Melchor Ferreyra, who is President of Adventist Church in Peru, was the main orator at the Camp.
week; in which youth - comma
also made their part - played their part
they got prepared- were prepared (what do you mean by prepared?)
Children proved their commitment with Missionary work, whom carried out a week of Prayer through out the region,- Children, who carried out a week of Prayer throughout the region, proved their commitment to Missionary work
the prompt return of Jesus Christ- imminent??