I want to start looking after myself a lot more and am interested in annual checks for cancers. where can i do this?

Good idea!: Cancer screening can be done by a physician who is up to date in the field of Oncology. Some of the PCP's can do this. Otherwise you can go to an Oncologist. Most Cancer Centers have a department of Cancer Prevention where such specialists are easily available. You should also look up the cancer screening guidelines at Cancer. Net.