Hello Hari,
Assuming your question is about expanding our repertoire of such words (and not how to use them grammatically correctly), I would recommend reading novels as a way of enlarging your repertoire. It is the descriptive texts in novels that will be full of adjectives and adverbs. However, I would suggest that you choose simplified graded novels where you will find common and frequently used adjectives and adverbs that you can use in your own speaking and writing. There are two good series you can choose novels from:
- Macmillan Readers
- Oxford Bookworms
And remember, as I recommend for any type of vocabulary building exercise:
1. Write down a phrase or a sentence that contains the word you're learning, not (just) the translation.
2. Check and learn the pronunciation of the new word in an online dictionary or use the audio version of the same book to hear all of it including the new words.