laser transfer papers help needed

Hi,

I need some advice on how expand my business but I as I am very small business I am worried about spending my money and making the wrong decision

I have been doing standard vinyl t-shirt, polos, jumpers and hoodies for about a year now and have a bit of cash to expand my business. I am thinking about getting a laser printer with white toner so I can print on black garments can any one tell me what is the best paper for color prints that works on all the above garments (black) but also is not heavy?

I would also like to know what is the best paper for one color designs that are very complex and thus cannot be done with vinyl and not as heavy and work all the above garments (black).

I hope the above is not to convoluted.

Thanks.