For all the pround first timers starting with a month long backpacking trips, below are the list of things to pack if you are heading to warmer regions:

Clothes
Trouser/jeans/lower - 2 no. 
Tshirts/tops casual - 5
Party wear top- 1
Shorts- 1
Scarf- 2
Towel-1
Undergarments- 3 sets
Bikini - for the beaches
Thin jacket-1
Night dress- 1

Spread sheet-1

Cosmetics kit
Body lotion
Sunscreen cream
Kajal/eyeliner
Lipbalm
Nail cutter
Nail filer
Nail paint remover
Nail paint
Small scissor
Razor
Washing powder small sachets
Shampoo - small bottle coz it's less messy than shampoo sachets
Shower gel with loofah- prevents you from keeping wet soap in your bag
Facewash- 50-100ml bottle
Cotton roll
Toilet roll
Tooth brush 
Tooth paste

Electronics
Mobile Charger
Earphones
Battery backup/power bank 
Kindle/Novels to read

Accessories 
Sunglasses
Hairband
Ruberband

Footwear
Shoes 
Flipflops
Trendy but comfortable flat sandals/ballies

First aid
Medicine for vomiting and stomach ache

Paracetamol

Painkiller

Band aid

Dettol

Paper soap

Insect repellent

Insect bite ointment