Honda CIVIC EX coupe 1998-MODS help

OK. Here’s the deal. I just bought a Honda Civic EX 1998…..I know what rims and tires I want…and I pretty much know what kind of exterior look I want, however I don’t know anything about where to go for interior mods. I don’t want too much speed but something to make it get a little more kick and where the heck can I go online to find stuff like this. I want a nice reliable and trustworthy online dealer just to check out. Does anyone know of anything good?