Determine the definition of the idiom 'At the outset.'

At the outset (idiom): 
English Meaning: The beginning.
Bangla Meaning: শুরুতেই / প্রারম্ভেই।

Ex. Sentence: I told him at/from the outset I wasn't interested.
Bangla Meaning: আমি তাকে শুরুতেই বলেছিলাম যে আমি আগ্রহী নই।

Other options, 
At someone’s heels - Just behind or following closely.
At one's finger-ends - Ready at hand / readily available.
At once - Immediately.

Source: website lecture.