Child custody and support, temporary custody, procedures in WA state to seek full custody of child

Everything in family court is done in writing, not generally by speaking to the judge at your court hearing. I would write out a declaration, indicating what has happened and what you want the court do to. Be specific. If you have receipts for items that need to be paid, submit copies to the court with a cover sheet. (ask at the clerk's office or law library for a sample). If you are asking for dad to pay his portion of a cost, take out the parenting plan and child support order that was originally entered. each paragraph has a number on it. Look to see what paragraph says he has to pay his portion. Refer to that paragraph, like so:
Paragraph 3.11 says that father is to pay his pro rata share for uninsured medical expenses which exceed $200 in any given month. Attached under separate cover is a receipt for orthodontics in the amount of $400. I am asking for the father to pay me his pro rata share etc.
Most local bar associations (each county) has a volunteer lawyer program or a modest means program where attorneys take cases on a sliding scale. call your local bar association for more help.