Man

Paradise is the place of every good act and every noble thought as Allah mentioned in Quran that all ill feelings will be removed away from the chests of people of Paradise (Al-A'raaf, verse 43 and Al-Hijr, verse 47).

Friendship between man and woman who is not Mahram to him will not be imagined in Paradise and no one in Paradise will think about it because it is not a noble thought. Women with out Hijab is also not a noble thought so no woman in Paradise will think about about it.

Wassalam.

Yes. Muslim should get married whenever he feels the need for marriage and it becomes necessary for him to get married when he feels that he might fall into sinful acts if he does not get married. Financial situation should never prevent or delay marriage as Allah (SWT) Promised to bestow His bounties and grant more sustenances to married persons then unmarried. The Prophetic statement says: He who avoids marrying because of fear of poverty, has under estimated the generosity of Allah. Hadeeth says: Get married , you will get more sustenance as marriage itself brings Barakah (Blessings in income).

Wassalam.

Islam keeps the respect of women and protects her from mixing with non Mahram men even with out physical contact. Such meeting for sports is not permissible as it can lead to unwanted results especially between young men and young women.

Wassalam.

If a pious believer had more than one wife in this life and all of them were pious believers, they will be with him in the Paradise but with out any jealousy or bad feelings between them.

Wassalam.

It is allowed for men to do so as far as it is not seen by your community as resembling women.

Wassalam.

Married man and married woman are not allowed to do any thing or speak any word which can initiate an intimate feeling between them. Divorce is the most disliked allowed act by Allah. Married woman must protect herself from anything which can lead her to Haraam. Married man must also be careful that anything or word with a married woman is very dangerous and can lead to hellfire.

Wassalam.

I was hoping that one of sisters will answer this question but as did not see any reply I am answering briefly:

Jealousy of the wife over her husband can be against the rule of Allah Who allowed the man under certain conditions to have another wife. Jealousy against a rule from Allah is direct or indirect objection on Allah's rule, that is why it is bad.
Jealousy of man over his wife is against any relation between his wife and any other man, which is always a sinful act because she is a married woman and never allowed any act or word which can initiate a relation with another man. Husband's jealousy over his wife (without false allegations) is good to protect her and the whole family from a sinful act. You can then compare between a jealousy going against Allah;s rule and a Jealousy to protect the wife and the family from a sinful act.

'Wassalam.

Yes it is permissible for her to recite Tajweed or Tarteel of Quran in front of non-Mahram men as far as there is no intention of lust.

Wassalam.

If the woman puts a condition on the marriage contract that her husband should not have another wife during he is married to her, and the husband agrees on such condition, then it becomes binding on the husband to fulfill this condition which is part of the marriage contract.

Wassalam.