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.
Have a look in the Settings App which is the grey icon that shows three Cogs or wheels, then press the General tab, then at the top of the page you will see About, press this.....look down the list and you will see Capacity which will show the total GB which your iPad has and below this you will see Available which is the storage that you have left. Hope this helps you.