I love helping newbies out.
If you're going to buy an espresso machine at a store like Walmart, kind of like a starter machine, make sure it's a pump-based and not steam-based machine (beware of "espresso machines" that come with a little glass carafe thingie). You won't get an excellent machine at Walmart or most department stores, but if you're just starting to explore the world of good coffee, there are a few decent gateway machines out there. I had a Krups pump-based machine for a while before I got my Silvia, and it was quite able to keep me alive for a few years. If you want a machine to pull cafe-quality espresso shots, you'll want a boiler based machine from another source.
But regarding your concern on sugar - you can drink coffee prepared with any method without sugar... try fresh coffee, it has more of a 'natural sweetness' in addition to a better flavor profile than the alternative. Drink coffee within a month of roasting, and grind just before brewing. If that isn't your normal practice, you'll be probably be surprised at the difference that makes. If you don't have a good burr grinder, you'll be more likely to find a good one of these at Walmart.