If you need help making the /th/ sound, watch this video. Remember to keep your tongue out, resting on your top teeth.
To practice speech sounds at home, try to aside 15 minutes a few times a week. Spend the first 3-4 minutes going through a word practice list. Then try practicing the sounds in a more natural activity, such as reading aloud or playing a simple game. See the Articulation page for more practice activity ideas.
I have lots more where this came from! I have many more resources that I just can't legally share on this public site. To request more materials for your child's specific goals, contact me! I will email them directly to you.