Add new lubricant and reassemble the bearing. Your local retailer can either do this for you, or provide the necessary supplies. The wheels will show wear with frequent use. It is advisable that once the wear is visible to rotate and switch the position of the wheels. Switching the first with the third and the second with the fourth and turning them so the inside becomes the outside, will lengthen the life of the wheel.
Tecnica skates have a normal heel brake with a rubber pad.
The brake can be mounted on either the left skate or the right. The brake should be inspected for loose screws. To change the pad, remove the screw from inside the pad, insert the screw into a new pad and reattach it to the brake bracket.