To learn general processes for setting up and solving word problems, try the following:. . . . .Translating Word Problems
Once you've studied the lesson, follow the links at the end of the lesson, which lead to explanations of common sorts of word problems (such as "uniform rate" and "coin" problems). This should give you a good start!
Note: There are books which cover specifically just algebra word problems, such as this book
. Your local library or big-box book retailer should have this or similar resources available. Check 'em out!