I want to try and start a family tree. My grandmother was divorced, and then remarried. How would I show this in a family tree? Also, I want to create a form that will ask my family members to tell about their lives so that I can create a book about all of us. It will allow my grandparents to fill out the information they know about their parents and family that has passed. Does anyone have a good form for this? Or can they point me in the right direction?

There are many visual ways to show more than one marriage, in a chart form. The problem with decorative "trees" (using the term loosely) is that they can be very time consuming.
Most researchers who accumulate a lot of information wind up using a genealogy program, which is set up to deal with all those persons. The LDS church offers Personal Ancestral file for free, via website, www.familysearch.org. It remains a standard… you can include pics, etc. Almost all the standard programs offer "gedcom" ability… that is, transfer the facts to a file that is interchangeable with other genealogy programs. thus, if you really got hooked and decided that you want/ need a fancier program (read, buy it), you just transfer what you have to the new one.
Another standard is called a family group sheet… which lists husband, wife, and children, and includes a space for the parents of each spouse.. linking back to the prior generation. YOu would do a separate fgs for each marriage, but in the program, they would "link". These are just the basic facts… not so much as a biography type thing, which gives more of a personal touch.
You may want to drop by www.cyndislist.com, which has a huge collection of genealogical resources, including tutorials on starting research, myths and hoaxes to avoid, etc.
http://www.cyndislist.com/beginner.htm