HMRC Admin 10 Response

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Please look here for the types of records needed as a self employed trader , Business records if you're self-employed

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I would recommend you speak to your employer to check this. The tax year runs from the 6 April in one year to the 5 April in the following year.

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Please look here regarding getting a national insurance number Apply for a National Insurance number

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Please look here National Insurance credits

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Please have a look at the guidance on ISAs here: 
Individual Savings Accounts (ISAs)
 

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You can find out more here: 
Tax-free allowances on property and trading income
 

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Please refer here Capital Gains Tax

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Please check here Check if you need to send a Self Assessment tax return

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Unfortunately, it is not possible to check individual tax records through this forum, if you have a question which relates to your personal tax situation or tax code please contact our helpline:  
Income Tax: general enquiries
On this page you will also see a link to Personal tax account: sign in or set up which may be the quickest way to review information relating to pay and tax history, tax codes and how to change them.