Read. First the manual to the machine when it arrives. Then, before you start, read the instructions for whatever you're making.
Don't expect perfection out of the box. Practice makes better, not perfect.
Try different types of sewing. Garments, simple quilting, home decor or craft sewing. You might be surprised by which you like best and which you do best. Not always the same.
Learn the difference between pressing and ironing. Big difference.
Have fun, make mistakes, learn, grow.