Serious issues after installing Mac os Catalina

[BOI123]

Hey guys ...so I successfully installed Mac os Catalina on my Dell Inspiron 14 3000. But now I have some serious issues and I have listed them below …..

1. WiFi is not working and in the network preferences, it 's showing only Bluetooth pan there is no other option.

2. The trackpad is not working and I have to use external mouse….luckily the Bluetooth is working so I am using a Bluetooth mouse but I really want the trackpad to work

3. I have some issues with adjusting screen brightness although the display has no issues, I can 't adjust the screen brightness….

4. The HDMI is not working ….I tried connecting the laptop to my TV through HDMI cable and neither video nor the audio was showing up 

5. My laptop has one single headphone jack for both external speaker and external microphone and I tried connecting my headphone and the audio is not coming through the headphone. The in built speakers are working good but I can 't get the audio to come through my headphone

These are the issues I found so far ….and I don 't know if there is anything else …..I tried using many post installation methods for installing the kext files ...but none of them worked ….

So please please please ….I request anyone to help me as I have made it up till here in installing the os….and if I can get these issues solved ….I am all good to go…..I would really appreciate if anyone can do the needful ….please 

Thanks in advance 

 I have also attached the pics of my laptop specs and also for some of the issues that I am facing ….please do help  

Edited May 15, 2020 by BOI123