I need some improvements made to my website

My existing website has quite a few broken and redundant links; links that when clicked don't bring any results.

I need someone to go through every link on every page to ensure they are all working.

I also have a few links to some free documents available for download. I need you to connect these to my Mailerlite to ensure the person who clicks it submits their name and email and gets it sent to them.

I also need this website connected to my Google Adsense account.

I also need you to ensure the website is mobile and desktop friendly.