Yeah, start with free -- walking and maybe some basic body workouts (planks, pushups, sit-ups, jumping jacks, etc). Start super small or you will quite right away. Like, 15 second planks, 10 pushups and sit-ups, 25 jumping jacks, etc). Up it 5 a week for 8 weeks. Then, incorporate more free stuff...lunges, squats for legs; chair dips, etc for arms, something for the back and shoulders, etc (google has a lot of good ideas). Again, smart super small. Another 8 weeks. If you are loyal to this for 4 months, you will have established a routine and you can safely spend money on something at home or join a gym, but it psychologically takes about 3-5 months to build up that routine to the point where you can get it done and enjoy it without feeling like its a chore.
Anyway, thats my suggestion for someone who ballooned from 205 (which I wasn't totally good with in general) to 235 in 2015. Incorporated this method and then joined a gym in 2016, then bought some home gym stuff when they all closed in 2019. Took a few years, but slowly for back down to 198-200. Cant get to 190 goal weight, but I am very pleased with where I am now. Legit took my 3 years to get there, because I wasn't willing to totally alter my diet.