Don't worry, the limbs should rattle when the bow is unstrung. They have what are known as "international" limb fittings (ILF), and they just slot in without any need to be bolted down.
Have a look at the Hoyt recurve manual for info about this type of limb fitting:
http://www.hoyt.com/technical/bowmanuals.tpl
That's a very decent setup. You might struggle at long distances because of the low limb poundage and the aluminium arrows, but you can certainly shoot 60 yards with that. And it's ideal for indoors. It should do you for about a year, after which you might want to move to stronger limbs and carbon arrows. You'll be able to get new limbs to fit without having to change the riser.