Good move! Rs 5k per month in a set of equity funds will get you best results. You can also invest in ELSS funds for tax benefit under Section 80C. There are good funds like Quantum Long Term Fund, Birla Frontline etc (latest list can be seen in many apps or websites. Over a working career of say 30 years, 5k per month can get you 1.03 crore if you invest tin Direct Plan Mutual Funds. If you go through brokers or banks you may end up with Rs 82 lakhs only due to compounding commissions.
For your retirement plan, also make sure you identify your goal by understanding your expenses. A good thumb rule si 25x your annual expenses.