A lot of what I say starts as a sound/a complete block. Just air coming out and a mouth noise lol. Something i've been practicing with my speech therapist is "light contact". Basically just trying to ease into the word, depending on what sound it is and what you're using the make the sound, try to not make it sound like a hard B or P. For example both of those require you to make your lips come together so try to just barely press them together. Really think about what you're doing to make the sound in your mouth. Sounds a little obvious so i'm sorry if you've heard this a lot. It's hard to put into words but also try to make it sound like you're pronouncing a word with an H at the beginning so it's very airy and hopefully easier to let the rest of the word out.