Welcome to res Peryton! ;D
I'd be more than happy to give you some tips just ask away. For starters, if you chose rancher as your cl*censored* all you have to do is click on the box like house with a blue pawprint on it at the top of the page to create a rancher. For a ramcher the main way to make tu is to sell pets and that's what your rancher shop is for.
On the otherhand, if you chose merchant as your cl*censored* do the same thing that you would to create a rancher shop except click on the box like house with the dollar sign on it near the top of the page. Obviously the main way to make tu as a merchant is to sell items. :)
You can also create a showroom which cane be done by clicking on the showroom link on the left navigation bar under the 'Play' section. Here you can place creatu that you don't wish to sell but also don't want to keep on your profile.
As far as feeding your pets goes, there is one of tu ways you can go about this. The first way is to hand feed each pet by going to your profile and clicking 'select pet' then go to your inventory and click a food item. The second way is by creating a food pen which can be done by clicking on the icon to the left of the tu money bag at the top of the page. Each day your pets will eat food from there so you won't have to deal with all the h*censored*le it takes to feed them one by one. To stock food in your food pen make sure you have food first. Pizzas from antonios pizza shop are a good source of food. Most are cheap and they fill up your pets fast. You can also go to the games page>chance>apple tree. Each day you can bisit the apple tree one time with each of the pets on your profile. After you have food go to your inventory and then quick stock near the top of the page. From there it's pretty self explaintory. You don't have to worry about feeding pets in your showroom or rancher shop though because their hunger stays as is once placed in either place.
If you need any other information feel free to ask. You'll find that many users on res are more than willing to help out. Glad you decided to try out res and I hope to see you around often! ^_^