How to set up guest access to wifi (chillspot+hotspot)?

Question

Computer networks

Good day.
If in general terms, you need to help make guest access to wifi with authorization in the browser (by teamviewer, preferably).
What is at the moment:
1) Modem + router Huawei HG532e which is connected to ADSL in router mode and distributes wifi.
2) TP-LINK TL-WR740N on which I installed the dd-wrt firmware.
3) VDS (Ubuntu) on which LAMP is installed, and on which I installed freeradius, but I did not manage to configure it (freeradius) to work with mysql due to an incomprehensible error.
What needs to be done:
1) Help to make sure that the huawei is used as an adsl modem, and the distribution of wifi goes through a tp-link with a configured chillspot.
2) Help make a hot spot (understand what is wrong with my freeradius setup or set up another free radius server + mysql).
3) Explain how the authorization page works (I'm a web developer, I'm going to build it myself using php + js). I so understand there it is necessary to know what records in what tables mysql of radius it is necessary to shove correctly.
4) The essence of the task is not entirely in setting up, but in setting up and explaining to me how it works (ps I'm not stupid, I just dealt with the network to a minimum)
The developer himself, but I'm not particularly friendly with networks. It seems to me that an understanding person is here for half an hour.
Ready to pay a good-natured person who responded to help.

Answer 1

And how many users do you expect? (Maximum WI-FI connection).
I just don't understand why it's so difficult. Raise the server in order to authorize users in the browser.
I offer a good and simple solution, buy a roller from MIKROTIC (price from 1500) ( https://market.yandex.ru/product/12358922?hid=723087 ) and set up hotspot on it.
Here is one of the instructions.
https://saiwifi.ru/page/nastroyka-routera-mikrotik .