I'm sure it's been mentioned in the 12 previous pages but you should factor in your costs. Food for starters. Shelter, any bedding (hay, stray, pine shavings), dietary supplements, and on and on.
I would start small. Maybe 30-50 birds. Get the hang of it. Keep very detailed track of all your spending - costs, profits - revenue. If you are making money with just 30-50 birds jump up to 30-50 more birds. Still making money? Add more birds. Starting this way has it's advantages....Just off the top of my head;
1. Initial investment for 300 birds is going to be HUGE. They won't start laying for about 5 months. You have to feed them and take care of 300 birds until they start making eggs. You won't make your initial investment back for a year or more (if it's even profitable).
2. By adding birds in increments you will constantly have a cycle of chickens that are laying eggs.
3. If you buy 300 birds and a year later decide you're not making any money or you simply loose interest (to much to handle, whatever reason) you are stuck with 300 birds to try and get rid of. Starting small means if you change your mind you can more easily get rid of the birds and your losses will be minimal.
4. It will help you build a customer base. It might be tough to sell 25 dozen eggs a day. But 3 dozen....more doable.
It will be tough for the average Joe to earn a living selling eggs. Big corporations do it because they collect eggs by the thousands and don't care about the health of the chicken and how it lives. Their costs are essentially insignificant. That's why a dozen eggs is only $1.30 at the grocery store. And they "reuse" the birds once they stop laying, further turning a profit.
I'd recommend you look at it from a hobby perspective. Gradually get your feet wet until you are able to swim. Don't quit your day job.
I would start small. Maybe 30-50 birds. Get the hang of it. Keep very detailed track of all your spending - costs, profits - revenue. If you are making money with just 30-50 birds jump up to 30-50 more birds. Still making money? Add more birds. Starting this way has it's advantages....Just off the top of my head;
1. Initial investment for 300 birds is going to be HUGE. They won't start laying for about 5 months. You have to feed them and take care of 300 birds until they start making eggs. You won't make your initial investment back for a year or more (if it's even profitable).
2. By adding birds in increments you will constantly have a cycle of chickens that are laying eggs.
3. If you buy 300 birds and a year later decide you're not making any money or you simply loose interest (to much to handle, whatever reason) you are stuck with 300 birds to try and get rid of. Starting small means if you change your mind you can more easily get rid of the birds and your losses will be minimal.
4. It will help you build a customer base. It might be tough to sell 25 dozen eggs a day. But 3 dozen....more doable.
It will be tough for the average Joe to earn a living selling eggs. Big corporations do it because they collect eggs by the thousands and don't care about the health of the chicken and how it lives. Their costs are essentially insignificant. That's why a dozen eggs is only $1.30 at the grocery store. And they "reuse" the birds once they stop laying, further turning a profit.
I'd recommend you look at it from a hobby perspective. Gradually get your feet wet until you are able to swim. Don't quit your day job.
). 
thank you for saying it. I have followed this post but bit my tongue n tied my fingers cuz my mama taught me not to say anything if u have nothing nice to say, so i will exit with this...follow the advice given, and in my humble opinion, 300 birds on 1/4 an acre is tantamount to animal abuse. Best of luck though.
