Nice choice,
@pterodactyl! Weitzman makes great shoes, and I'm sure you'll be very happy with your purchase
I waterproof my suede boots with
Springyard Waterguard. Apply the spray in a circular motion at a distance of ~8 inches, allowing each layer to set for twenty minutes before the next round. I typically do six coats prior to the first time of wear, and then touch up occasionally throughout the season.
The hair flattens after some time, so keep a soft brush for its maintenance. Don't allow stains to sit (I mean, it's common sense, but especially with suede shoes, dirt can be tricky to properly clean). I can't recall at the moment whether the Lowlands come with inserts or not, but you should absolutely use them to ensure the shaft doesn't wrinkle or deforms.
If you plan to wear your shoes year round, I would consider getting an extra sole applied by a cobbler--synthetic soles are both sturdier and less slippery than leather ones. At the very least prep them (the soles,
not the skin!) with mink oil, but then you still need to be careful about the conditions of wear. No rain or rough ground. If, however, you chose to retire the boot for a season or two, a tip is to have them professionally cleaned before storing, though it's hardly a must.
(Sorry if I hijacked a response prompt to bingeonvogue, ee, or classichic, but I figured I might as well chime in with some pointers. I once ruined a pair beautiful Pradas, and feel somewhat responsible to ensure no other shoe faces the same, dark, destiny.)