Selling Islamic items

Q: I would like to start a business. Since I'm very passionate about Islam, I want to start a business with an Islamic theme to an Islamic target (I am thinking of selling Islamic books or Islamic wall arts).

My question is, is it haraam to earn money from this type of business?

P.s. It is not that I want to profit from the fact that I am Muslim, rather I feel a big passion for Islam and if there is something that I would like to spend most of my time with, then it is Islam.

The practice of joint waleemahs

Q: In today’s times, we find the practice of a joint waleemah prevalent where the expenses of the waleemah are shared between the boy’s and girl’s party. Is this a Sunnah practice? In the Hadith of Tirmizi Shareef, it is mentioned that Rasulullah (Sallallahu Alayhi Wasallam) married Hazrat Safiyyah (Radhiyallahu Anha) during a Jihaad expedition. When the waleemah was held for this nikaah, Rasulullah (Sallallahu Alayhi Wasallam) asked the Sahaabah (Radhiyallahu Anhum) to bring whatever food they had in their possession. Each Sahaabi brought whatever food he had and thereafter the food was shared by all. From this Hadith, it apparently seems that the Sahaabah (Radhiyallahu Anhum) contributed towards the waleemah of Rasulullah (Sallallahu Alayhi Wasallam). Is it possible to use this Hadith to establish the practice of a joint waleemah?

Kaffarah for breaking the fast of Ramadhaan

Q: I am a 26 years old unmarried Muslim man. In 2010 during the month of Ramadhaan, I had done serious foreplay activities with my past non Muslim girlfriend while I was fasting, and this happened many times which I don't exactly remember (probably 3 times).

Afterwards I regretted and for Kaffarah, I gave money (equivalent to feeding 180 people for breaking 3 fasts as per my calculation) to a mosque imaam who said that he would give that to an old and needy lady for her daughter's marriage.

Afterwards I got to know that first of all I have to fast for 60 days continuously. Even after this, I couldn't stop myself from sinning.

During Ramadhaan of 2017, I made several online foreign Muslim girlfriends (on facebook) and did obscene and nude video calls with them while fasting which also might have spoiled my fasts. After this, I did not offer a second kaffarah.

Now I deeply regret all of it and I'm very depressed. My family is now searching for pious Muslim woman for my marriage but I feel that I'm not sufficiently good. As I am working in a multinational company, it is difficult to fast continuously for 60 days without a break. I have good health but don't have the courage to do it (also because there are several lunch programs with colleagues and clients and it's difficult to refuse everytime).

Please give me the solution for this. If the first kaffarah (which I have already done as written above) is not accepted and I don't fast for 60 continuous days now, will I enter into kufr?

Visiting one's fiances house

Q: Is it against hayaa for a girl, who observes complete sharee purdah, to visit her fiance's house in his presence even if she intends to meet her mother in law, who is her father's big sister? If the girl feels shahwat in her heart and gets bad thoughts in her mind will it be permissible for her to visit her fiance's house?