I'm with Steve - I would get the hole under control first. Go look in the Above Ground Pool section in this forum about repairing holes and if you don't find the information you need there then post a new thread and you will get some help. As Steve suggests, a pic would help if you need to post your question.

Once you get that squared away (and you get your first water sample test results) then you can work on water chemistry. One thing I would do though is to check your pH right away as low pH (6.8 or lower) can cause liner damage.

Peter