Hello,
In my experience, your best best is using a distributor / aggregator like Tunecore or Distrokid is distribute your music onto the major streaming and download platforms, as opposed to trying to do it as an individual. Not only is it much easier and quicker to list your tunes on the sites via a distributor, but managing them and getting paid for streams and downloads is much easier too. Moreover, it's one thing listing your tunes on Spotify etc, but it's another thing entirely getting people to listen to and buy them. Good distributors will provide assistance with that, eg Spotify playlisting services.
During my 15 years in the music business running a label and publishing house, I have placed a couple of thousand tracks onto these platforms, and used multiple distributors to do so. I know the process well, understand the requirements, and can guide you through the process, from choosing the right distributor to preparing the content and metadata, submitting it, and the steps you can take to maximize visibility.
It's unclear from your brief how many albums / tracks you have, and what exactly you'd like done. The fee, timeframe and milestones are thus negotiable. But please feel free to send me a message in the chat if you'd like to discuss further.
Thanks and all the best,
Hilton