Very unfortunate, but from your level of experience, not a good idea to try to learn bike repair from an internet forum — especially brake repair.
For starters, you have way to assess the quality or applicability of the advice you receive here.
ADDENDUM: If you insist on trying these repairs yourself and can't wait for a how-to book, then check the Park Tool website or YouTube channel. They have a huge library of step-by-step how-to videos — the first step being to gather the right tools and supplies.
WAY better than trying to do it in writing.