Have you read the intro to composting threads here:
https://www.helpfulgardener.com/forum/vi ... 35&t=29022
https://www.helpfulgardener.com/forum/vi ... 35&t=56881
Good places to start.
I really think compost tumblers are mostly a gimmick. To start with they are batch composting: fill all at once, then close and tumble. To have something to do with new compostables that come along, you really need two, one to fill while the other is tumbling. But many people have written in here about difficulties with keeping them balanced, not too wet, aerated enough etc. And they aren't really big enough for a good diverse hot compost mix.
Start a good compost pile now and you will have some finished compost for the spring.
Start preparing your garden plot now for spring. The foundation of a good garden is good soil and that takes some working at and building. Till your ground now (with good management this may be the only time you ever till it) add some good organic amendments (bought compost, fall leaves, manure*) and till them in. Mulch it over well with fall leaves, straw or whatever organics you have.
In the spring, turn the mulch into the soil, hoe the soil as fine as you can get it, rake and plant.
What to plant depends a lot on where you are, which you haven't told us. But one of the first things to learn is the difference between cold weather crops and warm. Cold weather crops are planted early, are frost tolerant, but mostly don't like heat and give up when it gets too hot. They are all the leafy greens, broccoli and cabbage, and most root crops like carrots. Warm weather crops die if frost hits them, but thrive in warm sunshine. They are tomatoes, peppers, corn, squashes, etc.
So start in early spring with cold weather crops. Many can be planted as seed as soon as the ground can be worked, which for me in zone 6 was about a month prior to my average last frost date. (You need to know your first and last frost dates; if you don't you can look them up by zip code here: https://davesgarden.com/guides/freeze-frost-dates/
) A lot of the knack of gardening is knowing what to plant when. You can find planting calendars for your location on line which will at least give you a starting place until you know your own garden better.
Best wishes and keep us posted on how your new compost and gardening endeavors progress!
*(any stable will give you as much free manure mixed with straw bedding as you are able to haul off)