Welcome Jourdan.

One of the nice things about a single speed is that maintenance will always be minimal once you get it in good working order, whether it's new or not (you get the same benefit from an internally geared hub like a 3 or 5 speed btw if you decide you want gears).

Some questions you might want to think about...Will you be using this to carry things? How much? You can carry things on pretty much any bike, but if this is going to be your grocery getter you will want racks or basket.

Is this going to be your main transportation or more of a supplemental fun thing? Again, basically asking if you want something fun and zippy or more practical. (or some compromise of the two)

Finally, just get out and ride as many as you can to get a feel for what works best for you.