It’s certainly easy enough to buy separate components from different places and you’ll probably save a bit of money… but since you seem to not have much comfort in the install, you may find it’s better to find a kit of parts that comes with diagrams and take the questions/stess out of it for you.
Better yet, maybe find someone who does these installs regularly and get them to do it in the laneway behind your house (and/or maybe for trade if you have more comfort in another part of the build you can offer in return).
In terms of brands… after a ton of research and looking into price/watt and overall efficiency- I was surprised to find that Grape Solar is typically one of the highest rated and most efficient brands (despite being among the most affordable and available at big box stores like Home Depot).
If you’re going to go through the expense of a solar install…might as well fill the roof with as much as you can fit.
The fridge will be you’re biggest draw for sure, but depending on your laptop usage you might be surprised at what you can pull through the inverter while charging devices.