Hi R.! I would just wear whatever makes you comfortable, which is kind of what I do now -- jeans mostly, t-shirts, some nice tops and blouses for an evening out or a formal gathering which can be something as simple as a black, fitted cotton shirt with a pretty embellished collar, some plaid shirts, sweaters or flannel shirts that you can wear for the colder months, a couple of casual dresses for special occasions, sandals, flip flops, shorts, flats, and sneakers. Just because you live on a farm and I live in a city doesn't mean you can't wear the same stuff I do! Ok, perhaps the flip flops are not practical being on a farm, but you could wear flats, or some boots. Cowboy boots with jeans or shorts are always cute and practical.
Here are examples: https://s-media-cache-ak0.pinimg.com/736x/7d/c2/55/7dc255...
http://www.thechicfashionista.com/images/womenscowboyboot...
https://s-media-cache-ak0.pinimg.com/736x/8c/ea/64/8cea64...
http://media.jolynneshane.com/wp-content/uploads/2011/12/...
https://s-media-cache-ak0.pinimg.com/564x/a5/77/7d/a5777d...
http://i.dailymail.co.uk/i/pix/2015/08/02/04/2B07719A0000...
You can Google "casual outfits" or "casual mom outfits" and borrow inspiration from there. I like the way Reese Witherspoon dresses and she's actually your age, so that's someone else you can use for inspiration. You can always shop online, Amazon.com offers free refunds most of the time, if the shopping in your town is limited. My friend lived in a small town and once a month, she'd drive 1-2 hours to the suburbs and go shopping for clothes for herself and her daughter, so that is another option. I buy my costume jewelry either online or at a Charming Charlie's, they also sell scarves, handbags, and other accessories at great prices. A simple scarf can change a plain black shirt you wore a few days ago and make it look like you have a whole new outfit. Good luck, I'm sure you'll look great.