This is highly perceptional and hence cannot be answered in an objective way. However, the information from students speaks about the following jobs that students often do to support living expenses ~ Retail Jobs like working in supermarkets, department stores, or smaller retail shops / Hospitality and Catering like jobs in cafes, restaurants, bars, and hotels / Call Centers like jobs in customer service or telemarketing / Research Assistant like some students may find opportunities to work as research assistants in academic departments / IT Support like if you have technical skills, there might be opportunities for part-time work in IT support / Childcare like Babysitting or working at a childcare facility.
Yes, Irish institutions have several scholarships in place to help international students financially to fund their education in Ireland. For example ~
NUI Galway International Student Scholarships, DCU International Student Scholarships, Maynooth University Scholarships, UCC Excellence Scholarships and alike. However the following some liberal scholarships to international students like National College of Ireland, Griffith College and Dublin Business School.
Yes, students must have health insurance to be able to apply for a student visa to Ireland. There are several insurance companies that sell insurance packages to the students. It would cost approximately Euros 150 to 200.
Spouse is usually now allowed to accompany the student while studying. One can have his spouse on a visitor visa however for sometime. When a student after graduation switches to a post study work visa, then he/she can bring their spouse to Ireland and they will then have the same open work rights like the student equalling his/her duration
Masters can be completed in a budget of Rs 10 to Rs 15 lakhs in fields like Information Technology / Computer Science and Business Studies from National College of Ireland, Griffith College, Dublin Business School, and CCT College. However depending on your profile, you may apply for scholarships to public universities and if awarded that may bring down the fee to fit into your budget requirements.