1 if all parts are hot, it shouldn’t matter. As soon as you touch anything with the solder, it should distribute evenly around the pad and component.
2 you just feed it into the joint
If you are not quick enough, the flux in the solder evaporates and it becomes sticky. At this point, clean it and start fresh. Other possibility is that you didn’t heat part and component enough for the solder to flow
1 if all parts are hot, it shouldn’t matter. As soon as you touch anything with the solder, it should distribute evenly around the pad and component.
2 you just feed it into the joint