First off, Welcome to BYC!
Looks like your other questions have been answered, so I will tackle the deep litter one. You need a mix of stuff for the litter, not just pine shavings, in fact, the pine shavings are one of the HARDER to break down materials due to the sap that is in them and kind of waterproofs each shaving. Good materials are things like fallen (dry) leaves off of trees, pine needles, dry grass clippings from mowing, sparing use of pine shavings, sawdust, twigs, wood chips, people have even tossed in entire logs and stumps which break down over time but give the chickens something to play with until that happens.
Basically, if you research composting, you want to have your bedding be the Carbon elements because your chicken poop is the Nitrogen part of it. Deep litter should smell like dirt or potting soil when done correctly, if it smells badly like chicken poop, you have too much poop for your amount of carbon (bedding) which is an easy fix, just toss some more on top! The longer the deep litter goes, the stronger your colony of bacterias and stuff that breaks everything down will get and the better and better it will work.
With your floor being solid (not dirt) what I would do is get your good mix of bedding materials in there (leave the shavings, just add more other stuff to it), then you just turn it every few days (until it gets started, once it's going good you don't turn it anymore) and add more "stuff" as needed to keep the smell down. Since the floor is solid, the bedding can't break down and sink into the ground like it will on a dirt floor, so you WILL have to remove some every now and then, I would simply shovel some of it out of the coup and into the run where it will actually break down faster due to the higher amount of moisture (compost loves moisture), in the run, it will sink into the ground and vanish.
If you DO want to use some on your garden, peel back the top layers of the stuff in the coup (once it's been going a while, probably close to a year), and remove some of the stuff from the bottom, it should be brown, crumbly, and smell like dirt under there. If it is all nice and smoothly crumbly and dirt smelling on the bottom, you don't need to compost it further, you can put it straight into the garden, if you're really worried about it, you can till it into the ground in the fall after you harvest and let it rot down into the ground over the winter and it will be safe in the spring for planting.
Looks like your other questions have been answered, so I will tackle the deep litter one. You need a mix of stuff for the litter, not just pine shavings, in fact, the pine shavings are one of the HARDER to break down materials due to the sap that is in them and kind of waterproofs each shaving. Good materials are things like fallen (dry) leaves off of trees, pine needles, dry grass clippings from mowing, sparing use of pine shavings, sawdust, twigs, wood chips, people have even tossed in entire logs and stumps which break down over time but give the chickens something to play with until that happens.
Basically, if you research composting, you want to have your bedding be the Carbon elements because your chicken poop is the Nitrogen part of it. Deep litter should smell like dirt or potting soil when done correctly, if it smells badly like chicken poop, you have too much poop for your amount of carbon (bedding) which is an easy fix, just toss some more on top! The longer the deep litter goes, the stronger your colony of bacterias and stuff that breaks everything down will get and the better and better it will work.
With your floor being solid (not dirt) what I would do is get your good mix of bedding materials in there (leave the shavings, just add more other stuff to it), then you just turn it every few days (until it gets started, once it's going good you don't turn it anymore) and add more "stuff" as needed to keep the smell down. Since the floor is solid, the bedding can't break down and sink into the ground like it will on a dirt floor, so you WILL have to remove some every now and then, I would simply shovel some of it out of the coup and into the run where it will actually break down faster due to the higher amount of moisture (compost loves moisture), in the run, it will sink into the ground and vanish.
If you DO want to use some on your garden, peel back the top layers of the stuff in the coup (once it's been going a while, probably close to a year), and remove some of the stuff from the bottom, it should be brown, crumbly, and smell like dirt under there. If it is all nice and smoothly crumbly and dirt smelling on the bottom, you don't need to compost it further, you can put it straight into the garden, if you're really worried about it, you can till it into the ground in the fall after you harvest and let it rot down into the ground over the winter and it will be safe in the spring for planting.