A good text in Lisp programming is e.g. Paradigms of Artificial Intelligence Programming: Case Studies in Common Lisp, by Peter Norvig
A good reference is Common Lisp the Language by Guy Steele.
Make a graph showing how the time required for each function varies with the size of the parameter n. For each function, give a formula that approximately tells the time required as a function of n, based upon your experimental data. Write up a couple of paragraphs summing up the results and what you learned from the experiment.
This is a minor assignment to get you started. Hand-drawn graphs and approximations of the formulas are perfectly acceptable; a fancy report is not expected.