If it falls flat to your feet, you need to try another mask. The snorkel should be adjusted so that it fits comfortably in your mouth without pulling or stretching against the mask strap. Most snorkelers prefer the snorkel attached to the left side of the mask, but this is also a matter of the design of the snorkel. If you are using a rental, rest assured your gear has not only been washed, but also sanitized. Tour operators cannot afford to issue deficient or unsanitary gear so they are taken care of after every excursion.
Most fins are gender-neutral.
Use your shoe size as a guide to determine what size fin may fit you best. Say you wear size 9 shoes. Try the fins sized 9-10 first and then go up or down in size depending upon their comfort. You want a fin that fits comfortably and is not so big that your heel pulls up from it when flexed. Fins tend to expand in water and a loose fin may slip off.