Based on what you have itemised above I will say what is needed now is just to learn what you really want to do taking into consideration your financial capacity. And even based on your response, you are already tilting towards a gambling site but I tell you, to build a brand that will compete with the already saturated market, its not cheap as the amount of work involved in the coding by be beyond what a friend can afford to do for free. Think well before delving into it.
Me and my friend have enough time (especially as long summer holiday coming up) to make a dice duel site. As for the money management, if people are concerned with how they can trust me (which I understand, as I trust nobody) I could use MoneyPot for the money-side of things. The dice market itself is very saturated, but there aren't many sites that have PvP games. People that start casinos just see big sites like Primedice and think like: Oh, Stunna has made millions, so I'll make a dice too rather than make a new type of game.
My approach is not same as other casino starters. I like the idea of something community-based and PvP-type rather than the ordinary dice. This is, mostly because the dice would not work.
As for the coding being hard, I sure believe you. The site is not in any kind of rush, however. It's not like I'm using my friend as a slave or anything, but rather as a business partner. We have worked together on a few previous projects in the CS:GO community, such as
CSGOPoker, but that got shut down and sold to a new owner when Steam rolled the changes to their ToS.