Which multivitamin and supplements do you suggest I take for better skin, stronger joints and overall health?

I don’t take any vitamins. I also can’t say I eat very well. My skin has been getting red spots/bumps and and overall I don’t feel I’m very healthy.

I hear that zinc and fiber are good in restoring good skin.

Also, vitamins D, K, B are supposed to have many benefits.

Should I take a multivitamin like GNC’s Mega Men to get enough vitamins.. do I need more than just Mega Men in terms of vitamins?

For minerals, what do you suggest that contains Zinc, Iron, etc.?

My joints are in bad shape and I also need better, healthier joints to sustain my career in music.. What do you recommend?

Your help on this matter is greatly appreciated.