J, ch, ch' are all pronounced with the tongue more or less as in the English examples. Dj, tc, tc' all have the tongue farther forward. Ch', k', t', tc', tl', ts' are all like their counterparts without the apostrophe, except that they are pronounced with a glottal catch. Gh is pronounced like g, except that the top of the tongue does not quite close off the airflow.
H is pronounced like English h, but a little harsher.
Try for a sound between the two. Note that Cahto h is not silent when it occurs at the end of a syllable. Tl' is like no sound in English. These vowels are always short in duration. Writing it with a double letter, as if it were a long vowel, is a holdover from Goddard's transcription system.