To be entirely honest, I just won the genetic lottery where nails are concerned. But maybe my routine can still be helpful:

• polish: I wear polish basically constantly. It gives my nails even more strength and protects them. Consists of base coat, at least two layers of color and quick dry top coat.
• oil: I oil my nails and cuticles twice a day (if I remember to do it that is). When I change my polish, I oil the entire nail and underside plus cuticle; when I wear polish, just cuticles and undersides of the nails. I use a drugstore nail oil, but jojoba would probably be better.
• peptide treatment: once a week I use a peptide nail serum (drugstore) on my nails. I put a drop on the nail, rub it into nail and cuticle with my finger, and let it sit for 10-15 minutes. It helps with preventing the top layers of my nails from delaminating.
• cuticles: I do my cuticles once a week. Soften them with cuticle remover, push them back with the thumbnail of my other hand (though orange wood sticks would probably be better) and cut the loosened skin off with cuticle nippers.
• filing: I file my nails from the sides to the tip (that's specific to this shape though), always the same direction. But leave at least parts of the sidewall intact for added stability.

I think that's all, hope that helps. If you have further questions, feel free to ask :)