Well, you should read some more about fleece before you make a commitment to that. Some of us got awfully sick of fleece and changed to something else.
The size of your cage has an awful lot to do with how much smell there is. If you've got her in a small pet store cage, it's going to smell no matter what bedding you use. If you have her in a cage of the recommended size, or preferably larger, you'll have less problem. Click the Home button above for recommended cage sizes.
You can't potty train her. You can train yourself to put litter boxes where she pees and poops the most, and underneath her hay rack, and that will catch most of it. Those can be emptied more often than you change the whole cage.
The squeaky noises are likely just her talking to you. They chatter to people and to each other.
As far as care goes, read the articles on the Home page of this site, and at
Guinea Pig Education, Care, Rescue and Adoption at Cavy Spirit. She needs long strand grass hay all the time to keep her back teeth ground down and to keep her pooping properly. Grass hays are timothy, bluegrass, orchard grass and brome, and you'll probably have to buy them online as they're not southern hays. She needs fresh veggies to give her vitamin C -- red and green leaf lettuce, bell peppers, and cilantro should be staples in her diet. If she's less than six months old, she needs alfalfa pellets, and if she's over six months, then timothy pellets. No additives to the pellets -- no seeds, corn, colored bits, etc. Just good plain pellets. The best ones come from (broken link removed) or Oxbow. Fruits are only an occasional treat. Read the "read me" sticky on the Diet and Nutrition forum for what she can and can't eat.
No hamster-like wheels, no salt licks, no leashes, no treats that have grains, seeds or a lot of sugar in them. The best treats are fresh herbs -- mine are absolutely wild for fresh dill, cilantro and basil, and will eat several others as well.
Watch her carefully on any higher surfaces. Guinea pigs have almost no depth perception. Their eyes are on the sides of their heads, and they'll walk off the edge of something without realizing what they're doing.
Welcome to the forum, and enjoy your pig.