What to look for in a bag pack? I assume you are going to hunt deer. But it really depends, are you gonna hike miles to hunt? or you gonna hunt short walking distance from the road on a tree stand? Are you going overnight?
IMO (and I am yet to take a Deer), a true hunting bag pack needs to be hydration bag compatible, it has to have many straps to make them smaller or larger, it needs plenty of padding in the right places, It should have a way to carry meat separate from the rest of the gear, good durable stitching and buckles, many pockets and compartments, a way to carry a rifle or a bow and hopefully fit adjustable. Most hunting backpacks describe weather the size is suited for deer, elk mouse and such.
There are many options online, the one brand is always popping up is Alpz outdoors. They have some of the lowes priced true hunting backpacks available, you just got to read the reviews because quality can be an issue for the hardcore hunter. You might or might not like some of the features in the different models.
You can start with Wallmart for basics such as headlamp, knife, rope, masking tape...etc etc. For other things like a basic camo top or pants, Turners outdoors can be an option but I got to tell you, the more I go there the more disappointed I get.
Boots prices go from. $100 to $150 min with an avg of $170+ and all the way to $300..the only place for hunting boots to try them on is Bass proshop.
Can you hunt with traditional construction boots that you can buy in boot world? ? Sure, Its not like you gonna hunt Colorado, Alaska or even high elevation in Nevada. But it sucks to hunt with heavy boots or uncomfortable boots. I highly recommend a soft lightweight waterproof boot for San Diego. Under Armour has a sale on a pair, I own for $110 and the fit is true and comfy. They might not last you many years if you hunt a lot but most affordable boots don't. Bass pro shop carries them too.
Don't be afraid to buy thru Amazon for certain things like binos, processing tools, game bags and such.
But IMO if you are in SD you need to drive to Bass pro shop. You get to see a lot of gear that you didn't even think about, they have many brands and you can talk to the sales guys. Plus is FUN!.
Good luck.