I am looking for advice on finding a bitcoin/ethereum "trading platform". I'm looking to be able to setup an account and track the Dollars, Bitcoin, and whatever else, held in that account (in a single place).

Does such a service exist? Is it reasonably priced?

I want to set some funds aside for (effectively) gambling, and want to be able to track those funds as a unit.

Robo-trading would also be a bonus.