I find this question very intresting as i own both technics 1210s, the club standard deck which if your serious about mixing would be the minimum standand of deck you would need, and i also own the best cd deck money can buy the denon dns-5000 which is a amazing bit of kit.
I still prefer straight beat mixing ( getting 2 records playing at the same speed then fading from 1 song to the other) on vinal for me its just that little bit better but the cost of vinal mixing soon adds up so i would recomend starting with cd decks coz the difference between the 2 nowadays are very very small, but let us know the make of the cd player before you buy it and we can all let you know if its any good!
Ok if you serious about djing i would buy this book it is great i have a copy!
HOW TO DJ (PROPERLY) BY F BROUGHTON & B BREWSTER
It's the dj's bible, it covers absolutely everything you'll ever need to know. How to dj (properly) covers it all, from why you should be djing, how to listen to music, beat matching, mixing in key, cutting, your first gig and turntable effects.