Electronic building?

I am looking to do a project that controls two push pull solenoid actuators on a timed set 3-5 times each. To start the timed sequence I want to have it set off by a munual button. The thing is I have no idea where to start as far as electronics/controls. Is there a way to control with blue tooth from a phone through an app? How much does creating a phone app cost? I would like to be able to adjust time sequences fairly easy and also at a reasonable cost. 12 volt battery source. What signal could I use and how would it be sent to a relay?