Repeat the previous step until you've reached the WOW Gold desired + rating
Right-clicking is used to activate your current "active" skill, such as beheading. If it's a recursive skill, like the lightning strike, you need only click once and it will repeat, just like a physical attack, until the enemy dies or you run out WOW Gold of energy.
Don't fear getting killed. Run if you can, but if you get killed it really isn't that much of a deal for a fresh character. Sure you lose a bit of experience, but it's not so bad with how little time it takes to get back early on.
For each upgrade step after +3, the % success is less than 100%. So what you do is add the cost of the appropriate scroll to the running total, then divide that sum by the % success for the upgrade step. Repeat the previous step until you've reached the desired + rating.
If applicable, add the cost of the appropriate elemental/enchant scroll, then divide by the % success for the scroll. Adding elemental and enchant seems to work 95% of the time for the low, mid, and blessed high class scrolls.
For mage staffs, if you need to dispel from lightning to fire or ice, add the cost of the dispel scroll plus whatever the anvil charges you for the dispel operation (I think 50k for middle class staffs).