To infinity and beyond!
Then the advices here are very valid. I would not go for a zoom lens. Learn to frame without zooming, you will benefit later on.
Make sure the f number is low-ish (below 2) to get a nice “bokeh” effect (background - or foreground if you want to - blur). Somewhere between 35 and 50 mm.
Or, if you want to get inspired, check a site like Flickr, look for pictures you like and check what lenses are used. Mostly that info is shown.
Awesome!