I don't think I need more than 6. I need to have 2 eggs a day for me and sometimes my dad will eat 3 a day.
You will need more than six. There are no breeds that reliably lay an egg a day. You won't need a lot more than six - but there will be illness, injury, molts, "mistaken" eggs, broken eggs, etc. Particularly if you are worried about sustainability in the long term. I'd plan 8-10 for 5 eggs a day, reliably. Sometimes you will get more, and can refrigerate, make pasta, breads, angelfood cake, mayonnaise, or any othe the other wonderful things eggs make possible. Sometimes you will get fewer.
As the very wise posters above me have said, small bodies, clean legs, large combs are what you are looking for. Comets meet all those parameters (and all the other commercial RSL varieties - ISA Browns, Cinnamon Queens, Red Stars, etc) but they are all hybrids - won't breed true, and a markedly higher tendency towards reproductive problems - so best avoided in your circumstance.
Were I further along in my culling project, I'd sell you some birds - they are being raised as foragers with decent lay and good resistance to local conditions. But my birds aren't ready to leave the property yet, the qualities I want (and that you would want) aren't there yet.
and I say that not to advertise for myself, but to make a secondary point. Unless you plan to breed, you don't need a "breed". Plenty of mutts will serve your purpose quite adequately.
As to the rest, you need to make a choice about how often (and how) you are going to move your chicken tractor, and how predator/weather proof you want to make it. Some of which will be informed by your land. low slopes, largely flat lands, you can move a lightweight coop easily, and stake it to the ground for weather. Keep it low, build it rounded as a mobile hoop coop and the winds will roll right over it. The worst part will be bringing fresh water all the time.
Or you can build a much heavier structure, move it less frequently with a tractor, ATV, or similar, and mount a solar charger on the structure to power (lightly) an electric fence. Doesn't help with aerial predation, not enough shock for the biggest predators, but plenty to stop a dog, coon, fox, coyote, etc from going thru - then use premier1 or similar to stake out an electric "run" from that large coop once its in position.
options, you have options!