Do i use my memory card when taking pictures of someone else?

I'm NOT a professional photographer, but i have a D3200 Nikon camera that my dad got for me, because i make some videos on youtube, and i also found that i Really love taking pictures. Well, my mom asked me to take some shots of her and then fix up some of her flaws (in her words!) using photoshop, and she really liked them and showed her friends at work, so now she told me that a couple of her friends want me to take their pictures and fix them up too, so my question is, do i just take their pictures using my memory card for the camera and then just email their pictures to them when I'm done? Sorry if its a stupid question, I'm just not sure how it works. Do photographers clients bring their own memory cards or something? But since I'm not professional or anything, do i just take the photos with my memory card full of my pictures? Thanks for any answers!

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