Op you are really worrying far too much, thousands of young people move out on their own.
I had my first flat and mortgage at 21!
So this is what you need to do,
Get familiar with www.rightmove.com, on this site you can identify an area by town or postcode, to find properties to rent ( or buy)
Start looking online now, start looking at the cost of rent where you want to live, consider whether you want to share a flat with 2 bedrooms or be part of a house share, or live alone in a 1 bed flat. Some houseshares include bills, other rentals don't. Each ad will specify. Think about furnished as you do not want the cost of kitting out a place.
Usually you will need to be permanently employed, for at least three months, with a deposit of 6 weeks rent and one months rent paid upfront. A decent credit history is essential, check yours through Experian, you have lots of time to improve it by using a Credit card and paying off the full amount each month, don't forget!
Some estate agents will charge additional fees, this varies, identify the most popular agents for the properties you are looking at on Rightmove, call and ask their move in fees.
Now assume you know what type of accomodation you are looking for and the approximate upfront cost, open a seperate bank account to save for this cost, start asap.
Do some searching online to find out estimated utilities costs ie gas, electric, water, council tax for the size of property and location.Get a rough monthly figure, add to rent cost and you will have your monthly outgoings covered for the property.
Add in travel,TV, broadband, phone, food, clothing, socialising cost and any other bills (work out per month)
Make sure the jobs you are likely to get cover the costs comfortably or reasses the type /location of the accomodation and start again.
Property rental websites are your new hobby! learn to read and compare.
Deciding how you want to live, where and what you are likely to be able to afford is the first thing.
Identifying utility costs, and how much you spend in addition, next creating a budget.
Saving next.
l'ts a big adventure, please don't be anxious.