Custom ecommerce website needs a few things fixed

hey, i got a custom website made on here and they person who made it didnt finish everything i needed being done. Needless to say im extremely annoyed with them and I need someone to fix the things they didnt finish. It was made on a wordpress account and I need a few things done such as: -search box to work - the photos on the website to not expand weirdly when uploaded - the monthly newsletter to be sent out from the website. everything is there it just needs a button that I can have it automatically upload on a certain set date. -I also need a few back end things. when I upload photos to the bottom slider the proportions are all wrong and it messes up my website, I need the box to be a certain size and whatever photo I upload it fits it to that set size. -when you go to checkout at the end and choose international or national shipping the buttons are covered by text so you cant click on it easily. Alright thats about it, thank you so much!