Once you have your scale and all the other items I mentioned in the article in place, start asking your friends and family if they want to sell or give you any articles of jewelry. Some people may be happy to help you and others may just want to get rid of it but can't be bothered to get it valued. Any profits you make will be put back into your business.
As with any business, there will be start-up costs, but smart people just keep reinvesting it back into their business. Also, keep your overheads low. Buy, sell, repeat and keep building up your capital. When a bargain comes along, you will then be in a position to act quickly.