The most important thing is to start with a good warm tone paper. We are lucky that these are coming back into fashion. Ilford, Fotokemika, Foma, and Kentmere (and probably others) all make them. I find that Ilford Warmtone is just slightly warm and Foma is decidedly warm. I haven't used the Kentmere product, but the prints I've seen have been excellent. The next problem is the developer. Warm tone papers show more variability with different developers that cold tone papers. I've been using Ilford ID-72 (which I understand is related to the old Ilford Warmtone Developer) with good results. There are many warm tone developers out there, but they can be hard to find. Photogrphers' Formulary offers Formulary 106, TD-32, and D-52. I've found they are reliable and have high quality. Compounding your own from raw chemicals is probably the best way to go if you have a scale. You can use a regular developer, but the tone will not be as warm or as full as you get with warm tone developers. Many people like the results from warm tone paper developed in Ansco 130 developer, which is designed for neutral tones. Warm tone papers also react differently than cold tone papers with toners, but I don't have much experience in that area.