I have been self employed since august and I received a 1099 from a customer but it is for the total both of the invoices combined. Is this the correct amount?

Perhaps.  The Form 1099-NEC should include all payments made to you for the year by one customer. If this is the full amount of income you received from the customer, then you must report that amount, as well as any other income from your self employment, on your Schedule C portion of your tax return.

Any and all expenses you paid to be able to earn that income will be deductible. This includes ordinary and necessary expenses as well as any equipment you might have purchased that were needed.

• To begin your self employment activity section of your return Search (upper right) > Type schedule c > Use the Jump to.... link
• Follow the screens.  You do not need to separately enter the 1099-NEC, but you can if you choose. It will flow to the Schedule C as business income.

Actually I would just enter it as Other self employment income or as Cash or General income. You don't need to get a 1099NEC or 1099K. Even if you did you can enter all your income as Cash. Only the total goes to schedule C.

Some general info on self employment on Schedule C.......

You will need to keep good records. You may get a 1099NEC at the end of the year if someone pays you more than $600 but you need to report all your income no matter how small. You might want to use Quicken or QuickBooks to keep track of your income and expenses.

There is also QuickBooks Self Employment bundle you can check out which includes one Turbo Tax Online Self Employed return....
https://quickbooks.intuit.com/self-employed

When you are self employed you are in business for yourself and the person or company that pays you is your customer or client.

To report your self employment income you will fill out schedule C in your personal 1040 tax return and pay SE self employment Tax. You will need to use the Online Self Employed version or any Desktop program but the Desktop Home & Business version will have the most help.

Turbo Tax Beginners Tax Guide for the Self Employed
https://turbotax.intuit.com/tax-tips/self-employment-taxes/beginners-tax-guide-for-the-self-employed/L2HLojrj5

What is form 1099NEC?
https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-is-form-1099-nec/L5fbwIFSn

Here is some IRS reading material……
IRS information on Self Employment
https://www.irs.gov/businesses/small-businesses-self-employed/self-employed-individuals-tax-center

Publication 334, Tax Guide for Small Business
https://www.irs.gov/pub/irs-pdf/p334.pdf

Publication 535 Business Expenses
https://www.irs.gov/pub/irs-pdf/p535.pdf