I do engrave a little, but I am still on the learning curve. It is not as easy as all that, believe me. I would advise practising on some scrap pieces before you go near anything good.
HS Walsh stocks gravers, the handles and the book. One problem is that you need to bend the shank and break the actual blade to the length required for your hand. As I said, it is better to get old ones if possible, as they are already shaped, admittedly to someone else's hand, but for a starter, and someone who is not going to be using them all the time for your actual breadwinning, that is fine.
Put engraving tools on eBay as your favourites, then, when they come up you will be alerted. I got some there, some in a local antique place, selected the ones I wanted, and put the rest on eBay again, ended not paying much. I had a look on eBay last night, and Murphy's Law, there are none at present.
For engraving crests you need the knife type, fairly fine to medium 2 or 3 sizes for various lines. You might also need a shading (multi-line) graver. I would advise looking round bootfairs etc to get one or two to practise with.
You will also need an oil stone or carborundum stone for keeping the edge on the graver sharp.
Read and practice, and eventually enjoy.