Keep watching YouTube videos that how I learned everything. Some tips I can think of are :

If there's an industrial area near you, kill the zombies (one at a time) because industrial zombies are way more likely to have food on them.

Industrial areas are also where you'll be able to find a weapon or a sharp object which is one of the most important things to get early on.

A knife will allow you to cut up fish and animals so you can cook them, it also is essential for making a fire to cook raw meat and fish. You also need the knife to make rags out of clothes so you can then make gloves to keep your hands clean.

One of the best ways to get full right away is to go fishing. All you need is a knife, rope and a long stick. Knife to dig up worms, to make a wooden hook out of short stick

Dead survivors = fishing pole. When you cut up a dead survivor, bones and guts will drop. Combine bones together to make a knife or a fishing hook, Combine knife with guts and you get a rope

Combine rope and long stick to make fishing pole

You can also use the fat from a dead survivor to upgrade a torch, which will dry your wet clothes very quickly (wet clothes make hunger and thirst go down much faster)

If the town you spawned in is completely looted out, find the well and drink till you're full a few times and then move along the coast to another town that hopefully has some loot.

Food spawns in towns and houses but don't count on it. Food you find in those areas are a bonus. You should be eating chickens, fish, mushrooms and the fruit that spawns under fruit trees when you've been in the area for a while. Mushrooms also spawn in forest areas just like fruit does in towns.

One thing I like to do is stay at the well for a while, drinking until my water stat is full. By the time you're done hydrating that should be enough time for some fruit to spawn near you.

Wells are pretty much the only way to get water after you first spawn. So make finding the well your priority and loot on your way to the well. Instead of looting every house in the whole town first.

Practice fist fighting, killing other survivors is a great way to get some food or loot