This pretty much covers it! A good recommendation for a bike lock is a U-lock, I've used this one for about 6 years: https://www.amazon.com/Kryptonite-New-U-Kryptolok-Standard-Bicycle/dp/B06XC66Z42/ You can use it to lock your front wheel and frame, and you can buy a cable for the back wheel as well but unless you have a bike with very nice wheels I wouldn't worry about it.
You can also use the Bike Project's Build-A-Bike program to assemble your own bike out of components, it's probably the cheapest way to get a decent bike and the people there are very friendly and helpful.