Car starts then stalls out and then all kinds of lights in dash start flashing like check engine light what may cause this

Flashing warning lights with the engine not operating doesn't indicate anything. However, of course, diagnostic testing and retrieving any and all diagnostic trouble codes in any of the vehicle modules could assist in the diagnostic process of finding out what is happening here. Also, having that new battery tested for state of charge and the ability to handle a load is important, in the event low system voltage is affecting proper operation.

Stalls out - does engine start back up immediately?