MIcrocontroller question

I know that this may not be the exact place to post this but I figure that some programmer out there may dabble in the language of microcontrollers and be able to answer this question. I am a total newbie to mcirocontrollers , I do not own one, I dont know what to by and well ..

Ok here goes.

I want to be able to control 5-7 prebuilt animated robots that are now running on 3volts of current. Another item is at 4.5 volts and still another item is on regular 120 volts. Can I buy a micorocontroller to turn on, turn off the items in any order i want and keep them running lets say for 1 minute  then rest for 2 minutes, while another is running etc.Then have different sections of the program where they all go on, all go off, one goes on etc. The 'show' would go on continuously as this would be a holilday display.

Can this be done ? What would i need? . I mean you have to be exact I can program a little. I coudl also get acces to an older pc to program the microcontroller.  The 120 volt item is not absoultely necessary as I coudl keep this running all day but it woudl be nice.

Thanks a lot

Tom