Equipment you will need
If you have gym membership you won't need to buy anything . Modern fitness clubs have more then enough. If you want to workout at home , you don’t need to buy fancy equipment . I bet you already have some of these items or maybe you significant other has them ,cover with dust in his garage :) If not ,all of these items can be found at any sports equipment store at a minimal cost.
Fitness ball
Suggested sizes: (You should select ball size where you can
sit with knees bent at a 90 - degree angle)
Up to 5'4" tall use 45cm
5'5" to 5'7" use 55cm
5'8" to 6' use 65cm
Over 6' use 75cm
Bench
You can use substitute a ball with the bench in the gym . But keep in mind that a primary benefit of exercising with an exercise ball as opposed to exercising directly on a hard flat surface is that the body responds to the instability of the ball to remain balanced, engaging more muscles .
Fitness bands
You can get a few bands in one set which
content two or three bands with different resistance.
In the gym you can use everything with cable and looking like this 
Dumbbells
3lb , 5lb dumbbells or you could buy adjustable dumbbells .They have plates which you can use with bar too
Bar with weight plates
If you already have adjustable dumbbells , buy the same bar brand and you will be able to use plates and locks there.
Medicine ball
I would recommend you to buy soft, easy-to-grip weighted ball .It comfortable to hold and not harsh for hands
Ankle weights
Balance disc
Strengthens and stabilizes muscles in ankles, knees, hips, and shoulders
Develops balance and joint stabilization