Pick up one of Raichlen's books, for sure. I don't have the one above, but I have one about grilling in general and it's great. Good recipes overall and includes rubs and marinades and such. I also tend to search the web for ideas and pull some info from here, some info from there to see how it goes. One of the best marinades I used for flank steak was, I think, Greg's and is on this site (pretty sure). It involves lime juice and tequila. Good stuff.
You say "steaks". I'm gonna go ahead and hope you are just talking about flank or skirt steak or the like. Regular steak (NY Strip, T-Bone, etc.) don't need no damn MARINADE or RUB! :stretchgr Seriously, for regular steaks salt (course if you have it) and fresh cracked pepper are all you really need. If you like it and are feeling frisky then mince up some garlic and smash it and put that on as well. Steak is all about the high heat sear. It has all the natural taste it needs. :razz: Beyond that and you move into the realm of people who ask for a nice steak well done and with ketchup.:crytears:
If you are truly getting into the whole BBQ scene, you need to try smoking some ribs or a brisket. You need to set a big chunk of time aside, but the results are awesome and it gives you a good reason to hang out with a beer, cigar and good book outside. :thumbsup:
A cautionary tale: I did this over the weekend. Unfortunately, I had lost my thermometer (I swear the wife lost it while "picking up") so all I had to go by for temp was the thermometer that is integrated in the grill. Those things are notoriously inaccurate so I should have known better, but it looked like the temps were right where I wanted it (around 250) so I let it go. Turns out the temp over on the side of the grill where I was keeping the wood chips may have been around 200-250, but obviously the other side of the grill was much colder. I pulled the brisket out after 6 hours only to discover (after borrowing a neighbor's instand read thermometer) that the internal temp was only 120*. I just picked up a good dual probe remote thermometer on Amazon for under $40. A good investment if you plan on doing this kind of stuff.
I don't have the recipe in front of me, but I really like Raichlen's "Java rub". Same general ingredients as most rubs, but this one uses a base of coffee grounds. May sound weird, but really, it comes out great.