As a first step you have to understand what is mutual fund and how does it function. There are basically four types of mutual funds, viz., Equity fund, Debt fund, Hybrid fund and Liquid fund. You may get some idea from the articles, the links of which are given below:-
(i) Different Types of Equity Mutual Funds
(ii) Top five tips to pick good mutual funds
There are many such resources which can help you to get initial knowledge. Please check the following two websites for this purpose:-
Thereafter, you have to chose suitable schemes based upon your investment aim , time horizon and risk-taking ability.
After chosing suitable schemes, you have to initially visit the Fund House for registration and for registering for online transaction option. For this purpose, you PAN card, AADHAR card and bank details are necessary. This may take around 15 days.
After completing these necessities, you can start investing in your chosen scheme(s). As you are a beginner, I would advise you to start investing in an equity-oriented hybrid scheme through SIP at the initial stage.