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If you know that the snake is really poisonous and could quickly kill the person if the poison spreads, constrict the extremity so that blood flow is reduced. Note that this will damage the bitten area. Otherwise, if you know that it's slow and a safer poison, remove constricting items so that the local area will not be damaged too quickly (and will not need to be amputated).

The affected person should move as little as possible and try not to use the poisoned area. This way, the venom will spread more slowly and the affected area will be harmed less.

Take the person quickly to a place where emergency treatment can be provided (hospitals, clinics, specialised snake treatment locations).

I found an article with much more information that could help you:

https://www.emedicinehealth.com/snakebite/article_em.htm#first_aid_for_a_snakebite

ice should first be applied on the area for make slow blood circulation. The poison must never be suck . And a non-rigid buffer may be applied. If the bumper squeezes too much, this is a distressing another situation.

After first aid , you need to be go the hospital and get antidote treatment. İf snakes poison is strong , doctors are inject for antidote.

If the snake antidote doesn't exist in your country , you need to go where the antidote is. they send it by emergency plane.

THINGS THAT MUST BE DONE IMMEDIATELY WITH SNAKE BITCH

1. Remove clothes or jewelry

Snake bites can cause swelling in a short time. Swelling can also be large quickly. The first step to make first aid easy is to open clothes by tearing or cutting so that the area affected by the bite can be seen clearly.

2. Don't move much

Can poison in snakes spread rapidly along with blood flow in the body. therefore try not to move much, if you need to tie a cloth to an area that is bitten by a snake to slow down the rate of blood flow in the area. Position the area bitten by a snake lower than the heart. This is also an attempt to slow down the rate of blood flow so as not to quickly spread to the heart and throughout the body. The key is don't panic, because if you panic your heart will beat faster which can speed up blood flow.

3. Do not clean the wound with water

So that the wound does not become an infection, immediately clean the wound in the area that is bitten by a snake but don't rinse immediately with water. Wet a clean cloth and gently wipe the bite wound. Then cover the wound with a clean cloth or bandage. Do not occasionally try to remove toxins by sucking or opening the wound because this is dangerous. Compressing wounds with ice cubes is also not permissible because it can break blood vessels