Help me with investing and suggest a few books to read about investing.

I’m a 29-year-old male, single, and earn around 70k a month after taxes. I work in government service, so I don’t expect significant salary hikes like those in the software industry. I own a house, which I got from my father, and I also have agricultural land, which was passed down as ancestral property something common in my caste. I generally spend around 15 to 20k a month. How should I invest the rest? And also experienced people please shed some light how marriage is going to affect finances. Thank you.