I’m looking to buy a PreSonus AudioBox USB, however I don’t know much about this stuff and I need some help.

Currently I don’t have any studio monitors or headphones that would connect to the AudioBox, but do I really need studio monitors or a pair of headphones?

For example, if I connect both my microphone and my keyboard will I be able to hear anything I’m recording while I’m actually recording it if I don’t have any headphones or monitors? Because after I finish recording I can just listen back to everything through my computer no?

Hopefully that makes sense, this is all new to me, but thanks.

(Side Note)
I do have iPod headphones, I just don't have any headphones with a 1/4” TRS cable. And if I understand this correctly that's what I need for the AudioBox.