@DeepSeaTide Interestingly, Albo hasn't been online since a day after his post here, so I'll try to answer for him. If I've read that wrong and I'm stepping on toes, apologies in advance.
First thing: Yes, a VPN is kinda essential as it hides who you are so protects you against legal action by copyright holders.
[Side note: If you don't yet currently have a VPN but plan to, try to find a provider that offers "port forwarding". It's not an absolute requirement to torrent, and few VPNs offer it, but it's a good feature to have. I won't go into why here, so I don't overload you with information!]
How are you currently downloading your torrents? Whichever app you use is often referred to as your 'client'. qBittorrent is one popular client, but there are others such as uTorrent and Transmission. Which is best for you depends a lot on your device, your operating system, and things like that. Personally I do prefer qBittorrent over other apps.
Whichever client you are using to download ("leech") should just as readily upload ("seed"). Once you have fully downloaded a torrent you cease to be a "leecher" and become a "seeder", for as long as you keep the torrent running and you have all of those files available, with their names and file types, etc., unaltered.
At this point, you get to two different seeding states: Availability and actual seeding. You get a small amount of bonus points here just for having them available should anyone want them. You get direct credit for the volume you actually "seed" (upload).
So to maximise what you upload, others need to want download it. A good way to ensure this is to grab new torrents, or newly freeleeched torrents. The advantage of the latter is that whatever you download doesn't count against your ratio. Once you've got them you can seed for as long as you like, but if your storage space is limited it's best to delete them once no-one else is downloading them from you, and replace them with newer torrents there's a demand for.
I may be explaining things you already understand, so I'll stop there. If anything is still unclear, or there's something you think I've missed, feel free to ask.