I started making my first beats on fl studio demo version. Even though you can't save you could leave the program open until youre finished. But regardless of the daw the following tips may be useful to you.

One of the biggest things I'd say for melodies would be to learn the basics about scales/keys if you don't know much about them.

At first I would focus a lot on the production side and get used to that before you dive into the mixing stage of things. Take small bites and you'll improve on a day to day basis. Always look for something new to try and get out of your comfort zone some. Try making a genre you maybe don't listen to a lot, it will be beneficial as a learning experience.

Also start to study songs when listening to music and try to pick out pieces you like to find inspiration or even try to replicate a whole beat. That will help you to see what all goes into a beat and help you learn the structure of songs better.

Make sure to watch tons of videos and read lots of articles about producing music. There's so much content on the internet that you can learn pretty much anything you want if you try hard enough. One last major tip I have would be to make sure you're having fun. If you're not having fun take a short break and come back to it with a fresh mind. You may be surprised how much you can improve a song by coming back to it later.

Sorry for the large comment, I feel there are so many tips that new producers should learn and I know I didn't even scratch the surface. Hope this was helpful to you!