I need help maybe adjusting settings on my Brother SE700

I am new to using an embroidery machine, and I am having issues getting my designs clean and in the correct places. Either the thread gets knotted/ bobbin thread showing or it embroiders way off from where it is supposed to be. Is this a tension issue/ what can I do to fix it? I think I am using good files I have purchased from Etsy that come with good reviews. I’m not trying to do anything too intricate right now either. I have attached pictures too- two where the thread is not where it is supposed to be and the other ”M”, the thread gets knotted and messed up. Thank you!