Nice! I don't know how familiar you are with bikes, so apologies if this is unnecessary, but with a lot of dust and sandy grit floating around and getting kicked up by your tires, you're probably going to want to clean and oil your chains and gears frequently. Dirt has the unfortunate tendency of getting caught there, and as the chain goes around, it turns both the chain and gears into sandpaper, and it will wear them both down really quickly. Also, after your first couple of rides, you might notice some slack in the derailleur and brake lines as the cables stretch a little and get seated in place. Don't blame the bike! It's normal, and can be adjusted.
You mentioned a suspension system on the rear wheel. That exists to absorb rough terrain while going downhill. Trying to peddle on flat terrain with either front or rear suspension systems is really annoying, as they absorb the power from your efforts, and you'll feel the bike dip down on every stroke. Some bikes let you lock the frame in place and essentially turn the suspension system off, some don't. Some people (like my wife) don't really notice or mind so much, so your mileage may vary.