If you don’t have a fixed internet connection it’s probably not the best idea to run a Lightning Node with lots of funds at home.
Since you are a beginner there are 2 good options.
1. Get an older laptop with at least 8gb of memory and at least 1 TB SSD and install Ubuntu on it , or try to get a Raspberry Pi 4 with 8gb and 1 TB SSD. On both you can install Umbrel. Make sure you have it placed somewhere where there is a stable internet connection during the initial blockchain download, this might take some days till a week.
2. If you just want to play with a Lightning node and don’t want to buy any hardware go to https://voltage.cloud and rent a Lightning node in the cloud for about 10 dollars a month, this is by far the easiest a quickest way to get started. But this doesn’t give you a private bitcoin node that you want to connect to your Sparrow Wallet. After a couple of months you can decide if you want to invest in the hardware.