I have used Floriani, Brother, and Exquisite XP thread in the embroidery machine. Sometimes a machine just likes a certain brand. They are 40 wt threads. Glide also works well. Pre-wound bobbins have more thread and thinner thread wound on them. They go along way. I always check the bobbin before thread color changes to make sure there is enough. I can change the bobbin in the middle of a stitch-out but don't like it.
If you want to do towels or lettering, you need a WSS (water-soluable-stabilizer). It can also be called topping. It is clear and washes away.
Check the "learning center" tab for information including a work book.
https://rnk-floriani.com/products.php#