when i render for animation I render for HD and my render size is always 1920 x 1080 dpi. I save my renders  in AVI formatt in DAZ studio & poser pro.

 when i use codex for saving my avi. I save as radulis codex 100% in Daz studio and Microsoft uncompressed VI in poser. for best quailty animations. if you render in PNG frames your files size will be huge and then you still need to put them together so saving as AVI is  best for longer animations runs

Then you need a movie editing program.  you can use Mircosoft Movie Maker which is  free or You can buy a good inexpensive video editing software at adobe,com called premiere elements 10 for $78 bucks. which will help you greatly when just getting started. with built in content music and movie editing help.

 

 biggest hang up I have with rendering for animation is the render times.   you got to be patient because render times can be very long. some scenes can take you days to render if your using raytrace shadow map

 

Good luck :)