why not try jumping ropes? cheap and effective. can even do at work.

if you are really severely overweight, then you shouldn't be exercising daily. your legs can't take it. once you lose more weight slowly you can increase the frequency.

easiest and least harmful is to just walk. park your car further away from your office. use the further toilets.

have to cultivate exercise habit before buying those equipments otherwise it's just gonna be another decoration at your home. what you should buy is a fitness watch and aim for for 2000 steps daily. if already 2000 then try 2500 or 3000 or more.

and of course, more importantly is to diet properly because you can never out exercise a poor diet. eat more protein cut liquid calories