Starting again kit

Hi all.
Before TLDR need some help advice mainly in
What gloves , I do suffer from cold hands , but good dexterity I'll imagine I need a few pairs, winter weight and for milder conditions.

What's a good seat post mounted saddle pack/bag I think between 5-15l small rucksack size for at most shirt, trousers, sandwiches , towel phone wet weather gear, change of underwear and maybe an extra layer just in case.

I only have 7 mile each way commute all tarmac some road some cycle path/off road but tarmac.
I work as a postie so be back out being active walking outside once I've ridden in. I know lots of posture just rude in their uniform.
I've had my bike along with all my old kit nicked so I'm starting again , but lighter and condensed down.
I've just got my replacement bike, Giant Defy advance pro, so ditched the rack and looking to only carry bare essentials in a saddle bag/pack.
Wheels/tyres set up tubeless, what do I really need?
Thanks

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