If you want it to be a very private and quiet introduction, without a lot of noise from everyone else's guns, think about going up to Pawnee Grasslands .
About an hour or so northeast of Westminster.

You pretty much find a spot (typically, in a ravine, to ensure you know where your bullets will stop), set up your targets, and shoot.
Buy or improvise a target stand (large stacked cardboard boxes, tied down, can even work). For beginner pistol, small paper plates can work for "starter" targets.
Although not expressly allowed, I've taken plastic bottles to use as targets...and always cleaned up my mess (packed out my targets, brass, and anything else I used).

Only cost is the price of gas and the travel time ( hour there and back).