Well, you surely need some initial investment to hire a coder (if you're not a programmer) and pay for some good HR. Then it is better if you have at least something special about your coin. This will help you succeed, As for the finances, a lot of coins are crowd-funded (ICO projects) and with nice advertising and some idwas that can help to raise incredibly good amounts of money. However, I think there are too many coins already and they rarely make a difference apart from just being out there for trading, so please don't create another one just for the sake of doing it!