plans to save for a car..

or even where to get a decent cheap car. i make 9$ a hour and work 4 days a week i get 10 hours on saturday and sunday and 5 on friday and monday 😩 ive estimated how much id make & it comes up to 400 something... but my last check was 167 but im pretty sure that was only for 1 week cus i just started this job.. anyways.. im trying to save up but how much should i put in my savings every paycheck? 😩. im also trying to save for an apartment.. my boyfriend also works so he will be saving with me as well with his money.. he makes a little more then me. ps i get paid every other week