Richard Foster
Adele Calhoun
Cornelius Plantinga Jr.
Start with fasting from one meal per week.
Whenever you fast, be sure to drink lots.
Keep you Bible and journal nearby; fasting can lead to insights as it creates space for contemplation.
Work up to longer fasts (perhaps a day to start). Do not do fasts of several days without guidance (especially if you have any medical concerns).
Don’t break your fast (if longer than just one meal) with a big meal but rather small portions of food; the longer the fast, the more you need to break the fast gently.
You may also choose to fast from other things (though food would be the traditional thing to fast from) such as:
television
social media
shopping
specific kinds of food (dessert, coffee)
Fasting: A Practical Guide by Adele Calhoun
Fasting Unto God by Arthur Wallis