In general, I tend to recommend fluorocarbon strings, since they stretch quite rapidly and maintain a stable pitch. However, for your particular ukulele, I truly believe you can’t go wrong with Aquilas. They tend to transform the tone of affordable ukuleles and make them sound far better than they have any right to.
Just visit https://ultimate-guitar.com, then change the chord diagrams to ‘ukulele’ using the available tools. All tabs are sorted by type; bass, guitar, chords, tab, and pro tabs. Just choose chords to the song you wish to learn, then utilize the chord diagrams whenever you run across an unfamiliar chord. It helped me a lot when I first picked up the guitar so many years ago — that site has been online forever, and has the largest collection of tabs I’ve seen.