Hi Roof,
19d Definition is "youth" and is I + the usual 1 letter abbr. for "name" + 5 letter word for "think". Your letters are correct.
18d Definition is "steep" and is a slightly whimsical way of saying what someone might charge for work at weekends around the 1 letter representation for "you".
22d Definition is "Muslim leader" and is the usual (or one of two) 2 letter abbr. for "church" around "a" + 3 letter word for "edge". Your letter is correct.
22a Definition is "cook up" (nothing to do with cooking) and is a 5 letter word for "banger" (as in a wreck) around the last of "mince".
24a Starts with an "F". The definition is "president" and is the usual 3 letter word for "pro" + 1 letter abbr. of "democrat".