• Is a woman`s neck an Awrah(private part)?
It is an Awrah, and it is forbidden for her to reveal it before non-Mahrams(Marriageable men).
• Should a person feel pleased, or have a virtuous vision after offering Istikhara(guidance prayer) in order to do what he/she had offered it for?
The result of the Istikhaarah is not necessarily that a person sees something (in his dream), or feels pleased, but the most important result of the Istikhaarah is whether a person is enabled to do a given matter or not.
• Is washing both openings(Istinjaa`) a must before every ablution?
Washing the front and back openings(Istinjaa`) is a must in case they have an impurity, but if they do not, there is no need for that, and Istinjaa` is not a condition for the validity of ablution.
• Should the father command his ten-year-old daughter to wear the Islamic dress?
The father should order his daughter to put on the Islamic dress once she turns ten, in order for her to get used to it.