Sometimes in the morning when I leave for school I get this weird bubbling sound coming from the engine and its kind of mellow but its really weird anyone have any ideas? It also swishes kind of like the way mouth wash sounds but its mainly a low pitched quiet bubbling

 

Make sure your coolant system is full.

 

Is this easy to do? Just go buy some and pour it int?

 

Yes, this is easy. Mix antifreeze and water in equal amounts. Add this mixture to the engine coolant reservoir. Bring the level up to anywhere between the MIN and MAX levels.

This is explained in the Do-it-yourself chapter of your Maxima Owner's Manual.