Welcome, ColleenT and SunnyHazel!

Whether or not your bike is put together well, it still probably would benefit from having someone who knows what they're doing watch you ride and make adjustments to the handlebars, seat, etc. They generally don't mind doing that at all -- even on a bike they didn't sell.

They know that all the extras are like crack and you'll see all sorts of things in their store you'll want (if not today, someday) and if they treat you nicely, you'll be back to spend money with them, too! Plus, they know that if the bike isn't adjusted properly and it causes you knee problems, "seat" pains, etc. you're much more likely to stop riding and then you'll never spend money with them. It's to their benefit to help you, so don't feel odd about asking.