This is an oft asked question and plenty of information is already available, so some searching first will help since there are different options and recommendations, some of which require free and/or paid software - just search on terms such as 'DVD ripping' and/or 'DVD conversion' - look at the list of threads generated and 3 or 4 appropriate ones should provide you plenty of direction - good luck and post back if you are still having issues!
The IPad Forum is a community of members from all walks of life and from all over the world coming together to share our experiences and to help each other learn about this wonderful piece of technology the Ipad. There is a wealth of information already here in the many threads we have so doing some searches will answer most of the questions you have. If then you cannot find the answer you are seeking then by all means post your question. There are many friendly and informed members here only too willing to help you.
google then down load anyvideo converter free.... free program works very well there is afree version and a paid more fetured version free one works well enough