Hello Edu,
well, actually your broker provides more than most of the brokers. Most of them offer about 65k-70k bars. So your is about 30% more which is not bad.
You will need to leave your Meta Trader opened all the time, and it will collect bars for you.
What you can do as well is from time to time(like once a month) to click all time frames over the pairs you are collecting for.
About the option to add on the position. I stay with 0.03 in the course, just because I do not want the students to jump with huge lots from the beginning. In some of the strategies you will find that the profits will be better when you add more times. That is why i left the option available in the EAs.
Kind regards,