It should "burp" skimmate over ever now and then but a new skimmer needs to be broken in so its jot uncommon to have it over flow. Just make sure you have it at the right water level and try to keep it just before spilling over by adjusting the flow
You just turned it on? It takes a few weeks to properly break in.
Where are you inquiring about it continuously spitting out water? It should continuously produce bubbles in the main chamber, and eventually it will form foam on top which will build up and fall off into the collection cup.