Unfortunately, we don't like to field, "How much to get high questions". Although, I can see you're new, and new-to-Opioid folks are generally of the group in the most imminent danger of overdosing. Luckily, you could most likely consume all of that Hydrocodone and just take a really good nap. That's the reality, but we're going to do the safety dance and approach this with the utmost respect for Harm Reduction in the process.
Firstly, 20mg is an adequate starting dosage for someone totally naive. There's no telling if you'll be in the "more affected" or "less affected" category, (I would need 80mg Hydrocodone without tolerance to catch a buzz), but you must play it safe until you know how you will be affected. Start with 20mg and see how it feels, from there on, you should be able to infer upon a more precise, correct dosage.
Do not take in conjunction with other Central Nervous System depresssants like Alcohol or Benzodiazepines. If you wanna smoke some weed, more power to you, but don't fuck around.
If you decide in the future to indulge in Hydrocodone, which is totally your choice, we will not direct you one way or the other, than you should become acquainted with the method of Cold Water Extraction, which removes the liver-toxic APAP from your pills and leave you with the desired substance in a more pure form.
