>>20712982 or 3 seeds per hole is usually what you want.
You pluck the weakest looking ones when they start getting their true leaves.
As for the garden beds, start with a moisture core. Google "core gardening" and "hugelkultur" and pick the method best for you right now. Huglekultur will probably do more for your garden, but you will need a bigger bed for it than for core gardening.
Then add pure compost and masonry sand in a 1 to 9 or 10 ratio. Put 9 or 10 shovelfuls of compost and 1 shovelful of sand in a wheelbarrow and stir it until its mixed, then put it in the bed. It's easier to stir it this way then to stir it all when it's in the bed. This creates a slightly sandy soil, which peppers like. The tomatoes will probably do fine in whatever dirt you got, so long as you add some compost to it and make sure the roots won't get waterlogged.
Mix in some topsoil for trace minerals, (though you'll probably be short on something).
Gardening advice is limited since everybody has different soil, climate, and pests. Keep track of what nutrients you're short on with pic related and what goes wrong this year, so you'll know what you have to do to get it right next year.
