First Time Grow Experiment

I kicked the plant into flower this week. After about 5 days I noticed a lot of small hairs starting to form all over. I also noticed the tips of a few leafs starting to turn brown and dry up. This is the first week I started to think about what I was giving the plant for food and really wanted to try and understand what cannabis needs to grow and flourish. I am still using the Dyna-Grow 7-9-5 and plan to use it through flower. I cant really afford to buy new nutrients at this point and am using what I have on hand. I also found out that the nutrients I am using are extremely old and probably not good at all. I continue as using them as I figure its better than nothing.