Happy New Year Oyugi,
I'm not sure I understand your questions, but let's see if we can figure that out together.
do i need to use unique proxies and ports if i am using tor browser.
If you are using the Tor Browser Bundle, you do not need to make any configuration changes to run Tor. You just start the Tor Browser Bundle. For step by step installation instructions, please click here.
Found a website that asks for a fee to give access to a private vpn to access internet, interestingly i have to use my isp sim in my usb modem for it to work,how is that possible?
Many VPN providers are subscription services so you may have to pay to use them. Please understand Tor and VPNs are not the same thing. When you use a VPN, you still need to have an Internet connection. So, if you are going to purchase a VPN solution and use it you still need your Internet connection (which I am guessing you get with the SIM in your USB Modem provided by your ISP).
is there a way to get internet access without having to purchase isp expensive packages.
You have to get your Internet from an ISP. Depending on where you live and what is available from local ISPs you can use Dial-Up, Broadband, Mobile Broadband, Wi-Max, or Satellite Internet.
finally please help me understand the role of vpn, free proxies and ports for internet connectivity.
To read about how Virtual Private Networks (VPNs) work look at this link.
To read about how proxies work look at this link.
To read about how Internet Protocol ports work look at this link.
Now if you don't mind, I have a question.
What are you trying to accomplish? If you are trying to connect your computer to the Internet, please see my answer to question 3. What are you trying to do with a proxy or VPN?
I hope I was able to help you with your questions.