Self-employed with Lionbridge and full time employed

Hi guys,
I'm new to the forum, how you doing?
I havesome questions about self-employment.
I will be doing my exam for Lionbridge next week, and finger crossed, I hope I'll pass it, but, how does it work with taxes.
I already have a full time job, and obviously I pay taxes for it.
Now I do understand that I will have to pay taxes also for what I earn via Lionbridge as self-employed, but, will I have to pay again for National Insurance?
Will I have to pay them monthly, quarterly, yearly?
Will I be put in emergency Tax code at my full time job if I start working with LB?
Will I have to register as self-employed before starting?
And ultimately, (for now :)) do you know how much taxes will I have to pay for it? Like the 20%? less? more?

Thank you for your support guys, and sorry for my bad english
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