Things you won't be able to do.

Weighted dips for chest - you need parallel bars like the gymnasts use and a belt with a chain on. YOu may be able to rig something up at home though.

Skull crushers - I do not advise doing these with a straight bar as you will fuck your wrists. As you have the bench, do close grip bench press- its far better IMO anyway.

Overhead cable pressess - you don't have a cable machine

Lat pulldowns - see above - do chins on the rafters in your garage

Don't do dumbbell side bends - you don't want to be adding size to your waist. The regular situps/crunches are fine.

Calf raises = you may struggle here as you have to go onto tippy toes whilst standing on a block. Holding onto a barbell at the sametime would be a balancing nightmare. I would do them one leg at a time and hold a dumbbell.

HOwever, for a beginner I personally think that if you do all of the above, you will be fucked and loose interest quickly. You do not want to be doing weights more than 3 times a week for the first few months. If I may, I'll suggest something for you to try, but I don't have time to type it out now. I'll try and do it by tomorrow morning.

Oh and last set to failure means you keep going until you can't lift anymore. You really need someone watching you when you do this otherwise on exercises such as bench press and squats the bar is on top of you