I'm very new to the forum and also newly back into cycling. Enjoyed the comments to this and am glad that I'm becoming more prepared. After looking at the replies I think I'm in reasonable shape. A LBS was closing due to retirement and had a great deal on a medium topeak qucik release seat bag. It expands if required but I haven't done that yet. Inside I keep a spare tube with a pair of nitrile gloves wrapped around the tube and then it put back into the tube box. (box is a bit rounded but still protects the tube), a zepplin cO2 inflator with two cartridges, a tube patch kit, all allen keys for bike (separate allen key set from auto tools with rubber band around them), expired ID with house key attached, $12.20, and a pair of tire levers.
In PA they punch a hole in your license upon expiry when they give you your renewed license. It's still considered legal ID so I ran a key ring through it and added a house key and tucked it in the pocket inside the seat bag. The money is $10 for whatever and two ones and two dimes in case I get stranded and need to catch the closest bus. Bus is $1.10 so I have exact change twice. lol.
I've sat out on the porch and watched the rain as I took my tire off, removed the tube, and then reassembled and reinstalled so that I have that comfortable.
I know that I urgently need cycle shorts followed by pedals and shoes but being that I'm in the infancy of my addiction I must maintain restraint and pace myself. As I cleaned the bike and noticed the torque specs labeled everywhere on the bike I realized that a good purchase which should serve me well was also a 1/4" torque wrench. As my wallet is also in shock due to recent bike purchases (his/hers) I opted for a chinese click type for less than $30 total. I can already tell that I will eventually want a chain whip and cassette removal tool but I think I'll get by without it for another four hundred miles on the bike. (at current pace that is about 2-2.5 months)
I'm also in the market for some good degreaser. I've been considering the ZEP citrus stuff at home depot but I'm also going to give a tshirt/rag with WD40 on it and floss the cassette to clean it. Being new to road I think I've got to try a few different things to see where my moneys best spent and I sure own rags and WD40. lol.