TVA tax confusion

Thank you for the information you have supplied about changing over to TVA. I just need to clarify some further details.

I run an auto-entrepreneur design and typesetting business in France, which is totally digital. In the next couple of months it seems as though my business will exceed €34,400 in yearly income, after which I know that I have to start including TVA in my invoices. I believe you said that I can obtain a TVA number by applying online at Impots.gouv.fr

Please can you advise me what exact extra information I need to put on my invoices :

1. For my EU customers (I think that TVA is added at 20%. Do I also add the client’s TVA number somewhere, as well as my own?)

2. For my UK customers (I think that TVA need not be applied so long as I include my TVA number and the VAT number of my UK clients, or alternatively, do I need to collect VAT at the UK rate on these invoices and pay VAT by re-registering with HMRC in the UK?) There seems to be conflicting advice about this.

Finally, is it OK to fill in a monthly TVA form (preferred) via Impots.gouv.fr based on TVA received, which I can then pay on a monthly basis? I think this is call TVA Regime mini reel.

Thanks again for your help.