As they said do be patient, take your time and do hours of research and reading BEFORE you start a tank!!!!!! Once you have the basics, research more into every detail then some more research on the details you just learned and when your think you know everything read some more. In between ask questions about the details you don't understand or need advice on something. Now you have some knowledge on what it takes to keep a saltwater
aquarium. Decide what livestock you want and what needs they have that have to be meet and plan your tank set up around that.
After you do the above you will have your answer! If you still have your question after you do some research You didn't do enough research and reading!
Not trying to be a jerk but I can't stress enough what I just said. We are here to help but can't give you our knowledge through osmosis haha.
Here is a good link to start with - Beginners Guide to saltwater reef aquariums
Im positive others will have other great sites they can also post for you.
But for your sake the answer to your question is first don't start the saltwater hobby with a 10 gallon tank aka nano tank. Its incredibly difficult to maintain a nano tank especially a 10 gallon tank. Everything from maintaining temperature, salinity, nitrates just to mention a couple of the things you will learn about through reading. Will be nearly impossible even for the most advanced reefers to maintain stable consistent parameters. In other words the larger the tank the better, so buy the largest tank that money allows. It makes it easier to maintain stable levels with larger water volumes.
A couple famous lines in this salter water community are most importantly "there is no shortcut, cheap, it'll get me by for the time being way of doing anything in saltwater" you will lose money and end up more money then if you were just to do it correct the first time and "The solution to pollution is dilution"
Im not trying to scare you away from saltwater, only trying to keep you from making the rookie mistake every reefer at some point or another has made. That is jump the gun and dig yourself a hole you can't get yourself out of by not doing the research and doing something without sufficient knowledge.
Hope the best for you! Please feel free to ask questions on anything you can't find the answer to.