Okay I have had fresh water fish for a long time but I decided I want to try a small saltwater tank, but I don't even know where to start, I have a 10 gallon tank ready to be set up. Any advice will help.
Go bigger. Ten gallons is harder to keep and you have very few options with fish etc. Bigger is better. I recommend no smaller than 55 gallon. You will eventually want bigger.
Well of you want a cowfish the minimum recommended tank size is 250g! You will have to check out some nano fish for a tank that size and some beginner ones at that I know aquarists who have been in the hobby for years and still won't attempt a cowfish...
Having a saltwater tank, it is extremely important to not buy something blindly without researching first. It can make costly mistakes too and unlike FW, corals and fish aren't as tolerant or hardy. Patience and research is the key to success in this hobby. It takes time, but really does pay off. Ton of threads, articles, videos, etc. you can look to help too.
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