One bit of experience I forgot to include.  I liked using the paper towels only the first week.  Why?  because I can assess their poop for abnormalities, easy to clean...three times a day....just roll up...and toss in the compost bin.  Now, I am on week two....on top of the textured shelf liner, which I wash down each morning with vinegar solution, I top with the news paper (free) one layer and then the shavings.....Beauty of this now is....the fine pine shavings absorb so much more poop...you just roll up the paper towels and newspaper with the shavings....toss into a bucket which I keep on hand in the bathroom, a broom for clean up,  dump out the shavings into the bucket and I wipe down the entire bin with the vinegar solution.  What I find with this routine, even though my chicks are in my master bedroom, there is NO smell.  I keep the fan going in there  and that keeps the air circulating.  I also open the window on a nice day when I clean up the area for fresh air.  Puppy pads are way too expensive and too much plastic in my opinion.  So, I have two huge Tupperware bins...one for the brooder and one I place the chicks in when I clean out the brooder.  The chicks at week two seem to love scratching in the pine chips.  I use Petco SoPhresh softwood small animal bedding.  A little goes a long way.  I put a mirror in there that hangs on the wall and they LOVE it...keeps them engaged all day.  I also sterilized a branch from the yard to give them practice roosting.  They feared it at first, but now love it.  Enjoy your chicks.  Your natural mother hen instinct will serve you well.  Let me know how you make out.
 
                                                   
                  
                       
                                                
                        
                                                                  So Phresh Natural Softwood Small Animal Bedding, 8.1 Liters