I started playing guitar when i was 12 (classical guitar), then i learned electric around 17.
And i kept playing until 23, when i moved to CANADA. I didn't play since then (barely few times, now am 28) and i would like to start again.
However, when i used to play, i rarely used the pinky finger because i have big hands (not an excuse, but this is how it happened).

Now that i almost forgot how to play after long absence, and i want to train again , i thought why don't i start training the pinky from scratch.

What is the best way/exercises/techniques to train the pinky?