Apps themselves in general aren't very big storage space hogs, at least comparatively, it's the content they're tied to that will add up and accumulate. If you have a large number of photos, videos, and music, those what you should push off onto your microSD card.
If you do start splitting up your apps so some are in your internal memory and some on your card, always keep in mind that when temporarily removing the card to do stuff like file transfers to a computer, don't use your phone until you put it back in as it's expecting that card to be mounted. If you instead focus more on keeping all your multimedia type files on your card, that will help keep the internal storage media from filling up too much.
Samsung includes a basic file manage app that you can use to manage your files, just look in your Apps menu for the 'My Files' app. Look in the My Files 'Settings' menu too, to optimize it for your purposes.