All terrible advice so far. Solo merchanting is definitely the way to go. You can make 1-2m a day with 10m if you're good. You will realistically make 250-750k a day starting out if you are inexperienced. Public clan merchanting is one of the highest risk investments you can make. Don't do it. I would start by flipping raw materials or popular items that are in the 500gp-1.5k range. This means find a popular item in that price range that is rising (this requires you to do 10-15 minutes of searching on the database) buy as many as you can a little over mid then sell a little under max 4 hours later. You can potentially do this 6 times a day, but you will only do it 2-3 realistically. It takes a little work on your behalf to research items, but once you are good it is very rewarding. Good luck!