I need to type Indian languages from keyboard.
I don’t know anything about indian languages but for windows I would approach it this way:
Install a second keyboard (software not hardware) for your indian language. Go to Control Panel → Region & Language, click tab “Keyboards and languages”, button Change keyboards… a new window opens, in the tab general Add a new keyboard, which you can select from a BIIIIG list.
The problem is now to find a reference for your hardware keyboard to the 2. software keyboard -which key relates to which-.
You can find stickies here.
Second Solution: Use Windows Character map or in LO Insert-> Special Character to locate your letters and copy them one by one into your documents (not very fast not pretty). You also have to find a font that includes your letters.
I hope it helps or gives you an idea how to solve you problem.