Repainting old garden furniture

[Bonsai]

I’ve had my garden furniture for several years now and the weather has dulled it and caused some rust. I’m not ready to replace it and thought the best thing I could do is put a new coat of paint on it and just buy new seat cushions. I’ve never been the kind of person that buys something new just because the old one has a few years on it. I like taking something from looking old and used to looking new and dazzling. What type of paint to you suggest I use on the metal parts of my garden furniture? Also there are some parts of my furniture that has some plastic fittings that need repainting. I need to know what kind of pain I should use on the plastic fittings. Also, should I first strip the old paint and rust before I try painting or will it be ok to paint over it? This is something new for me and I need a bit of guidance on the project. Thank you for your help.