Lemmy Support

i know this is already asked before, hope someone link me up. i am just a novice ubuntu user and i am getting familiar with terminal, but i am struggling with setting up this yml file and all.. no fancy stuff: i just want to self host so i could avoid api rate limit error and browse limitlessly. i have a spare laptop on top of which i could run the server: my home wifi isnt very fast just i could afford to feed it 50kb/s down and 30kb/s up...idc if its slow as long as i could filtler what i am browsing. would i have to pay for a domain ? thanks.