I agree with Rainbow. To find out what you need to add for fertilizer, get a soil test and if you want to be organic ask for organic recommendations. Instead of trying to plant now, I would just work on building the soil. You can till up the soil but if that is a lot of work, consider lasagna gardening and the no till methods.
If you do a biointensive or no till gardening you would have to do some double digging, but I would get some help with that. You only have to do it once.
https://extension.oregonstate.edu/lane/s ... osting.pdf
https://www.greenschool.org/community/gr ... gardening/
P.S. The biointensive method is meant to be self sustaining, but if you can't get the calorie and carbon plants worked in to your garden, you can still import what you need by adding grass clippings, leaves and twigs, bark chips (get them from your neighbors and landscapers in the area are usually more than happy to drop off chips), kitchen vegetable scraps, newspapers into your compost pile and by cover cropping.
Since you are having a baby, you want to make sure the garden is the size you can handle.
Select a site in full sun that gets at least 6 hours of daylight. People are always tempted to make the bed up against a wall, but it is better to have a pathway 2-3 ft wide between the wall and the bed. Make the bed itself no more than 4 ft wide so you can reach across and work the bed without stepping in it. Another reason to have a path along the wall. Many plants do not like to be up against a solid wall. The wall will heat up and only a few plants appreciate that in summer and it will cast shade on the plants for part of the day. A solid wall prevents air circulation which can lead to more disease problems.
Put the trellis on the north side so it will not shade other plants. It is best to have the trellis in before you plant tomatoes, cucumbers, beans or peas.
Adding pvc hoops on the garden that can be taken off is good if you need to use a protective cover for your plants.
Choose your plants so that they are things that you like, are relatively expensive to buy, taste better fresh and are easy to grow. Herbs are a good place to start. They can be kept in containers saving garden space, they are relatively expensive to buy and definitely taste better fresh. Some of them are perennial so with care they will last a very long time. And most of the herbs are not real fussy.
Lettuce is a 40 day crop as well as some of the Asian greens (40-50 days) and they are good crops for the cooler months.
Carrots, onions, potatoes are relatively cheap to buy and I can't grow enough to meet all my needs and they take a lot of time and space to mature so I only grow them when I have the time and space and want a challenge, I don't always get great results with carrots. Green onions and chives are good though since a small pot can last a couple of years.
Cut and come again plants are good choices as well as plants that produce over a long season. Kale, zucchini (summer), tomatoes, peppers, pole beans, eggplant, will give you repeat harvests. It is good to plant a fruit tree or two if you have the space somewhere.
Start small, and do not get overly ambitious. Gardens take a lot of time and need regular tending and so do babies. The demands of the baby will come first so you need to make sure you have time left for the garden.
It will help if you automate the watering of the garden. When you establish the garden bed, put in a watering system, either a drip system or a sprinkler. (Drip is better, it wastes less water and you won't wet the leaves.) Attach the system to a timer on the faucet so the garden is watered automatically. You should still go out everyday, you may have to make adjustments to the systems or hand water some pots unless you use emitters. Once a month you should run the system in manual mode to make sure everything is working. Inspect the plants for pest problems and take care of it before they become major problems and do some harvesting and weeding.
Add compost to the garden every year and mulch. The garden will not lose water as quickly and you can water less frequently. You can start your own compost pile.
Happy gardening in Hawaii. Gardens are where people grow.