Building a Blockchain wallet

My team is building up a project from scratch, where we develop an online blockchain wallet, which allows to store, send and receive crypto. Examples are Jaxx and Exodus. Additional to its basic functions, it provides also a platform to exchange FIAT with crypto. An additional plug-in is a market overview of coins (integration from Coinbase, e.g.).

Please send me the details what do you need (additional developers in the team, what skills, budget, further detailed plan) and how long will it approximately take to build it? Thank you.