What I would strongly advise as a beginner, is to get some books that have a fingering guide in place, and work through these songs. I find that if you get correct fingering in place as a beginner it will help you follow suit and give you an advantage in more technical pieces.
The Kenneth Baker books on Piano are a great place to start with this. Another little tip, I show my pupils is how to make the most out of each finger and not try and struggle, to change awkwardly to use a stronger finger, to kind of think of your fingers as numbers and look at the piece and try and think of it as a simple scale, so to turn on a 3 or change finger on the same note to give you more fingers to expand your hand and play higher or lower notes!!!
Keep going with scales, as I really do believe that these give you brilliant technique and eventually your fingers will feel more natural with where they should play the notes, and it won’t feel uncomfortable for example to use your fifth more frequently or your 2nd.
Improvisation is something that does require practice, but what I would suggest to improve your skills is to learn blues scales and to learn some 12 bar blues progressions, as this style of music can be placed in a variety of different styles and the blues scales will help with solos if you were to play in a band.
A simple 12 bar blues can be used in so many rock and roll songs as they normally originate from this formula, and will help you with your improvisation. Start in simple keys and then try out different key signatures once you are familiar with one.
Another good exercise book is the Hanon exercises these work on controlling technique and strengthening up each finger.
Hopefully there's plenty for you to go on there

I have a useful 'Contrary Motion Exercise' video which is fun and very good for practice that I can send you. Just PM me if you would like it. It's free by the way, but my students use it for home practice.
Samantha