Soft start dc motor controller

Hi All,

I am looking to build a dc motor controller for a model ski lift. at present it only has an "On Off" switch, I would like it to include a soft start, reverse and half speed switches (push button type).
The motor drags about .6 amp and is a 6 volt dc type.
The idea is to give the model full automation and realisim,

any help would be great