First, watch this video of Jason Mraz singing his song "Lucky" with a fantastic Mexican singer named Ximena Sariñana.
You can pick and choose from these links. The first few are good ones to get you started.
http://www.quia.com/jg/1211337.html
http://www.quia.com/jg/411708.html
http://www.quia.com/cz/77055.html?AP_rand=1048135701
http://www.quia.com/jq/47756.html
http://www.spaleon.com/pres.php
http://www.quia.com/jg/411708.html
http://www.quia.com/jg/370326.html
http://www.colby.edu/~bknelson/SLC/presente_stem_change.php
http://www.quia.com/hm/168176.html
http://www.colby.edu/~bknelson/SLC/presente1.php
http://www.colby.edu/~bknelson/SLC/chart_pres.php
http://www.quia.com/pop/46493.html?AP_rand=1491887112
http://conjuguemos.com/home/docs/nologin/spanish_verbs_verbs_5.html
http://www.quia.com/cz/26955.html?AP_rand=1896010310
http://www.stolaf.edu/people/hansonr/spanish/verbs/index.htm
Choose the titles directly underneath the title, "Verb Forms".
http://www.trinity.edu/mstroud/grammar/
The following is a good "Gustar" practice. There are many more under, "Etapa Preliminar" in the Categories on the blog.
http://www.colby.edu/~bknelson/SLC/gustar1.php