Remixes aren't meant to be a daunting thing and can be done in a number of ways but I will say for me my main tip is to,
start by just picking your favorite song and drag it into your daw, use it as a template, a map if you will.
Then take a audio clip of the remix stems, I always go for the melody and chop it up and pitch shift things, or I just treat it like a brand new track with some samples I got.
What also helps me is having a pre-saved template with my synths, eq and effects already to go.
Last word is to remix songs that you like, not every song is going to be to your liking and thats ok, sometimes its a good song but you just don't care to remix it, so don't force it.
And if you get irritated with where its going save it, and give it a day or so and start with a fresh mind.
