Start here: http://www.google.com/webhp?rlz=1C1GGGE_enUS379US379&sourceid=chrome-instant&ix=sea&ie=UTF-8&ion=1#hl=en&rlz=1C1GGGE_enUS379US379&output=search&sclient=psy-ab&q=DBQ%20on%20the%201930's%20and%20the%20great%20depression&oq=&aq=&aqi=&aql=&gs_sm=&gs_upl=&gs_l=&pbx=1&fp=190a38aff74067d&ix=sea&ion=1&bav=on.2,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&biw=1334&bih=613
You should be able to locate specific ideas and documents in those search results.
Another thing to try is to search your topic (once you settle on one) here: http://scholar.google.com and http://books.google.com
i have went to the link you provided and i saw some good information. i just do not know how to exactly word the question to make it a good DBQ.
You mean "I have gone..." -- right?
In the following links, there are sample exam questions. Don't choose one of them, but use them as ideas for making up your own.
http://www.socialstudies.com/c/search.html?Record_Type=Products&Subject=U%2ES%2E%20History&Subcategory=Depression%2FNew%20Deal&+s@KMCxLXtTluPRk (Don't buy anything! Just read through the topics.)