Hey animesh, i agree with what has been said so far, but i've always looked at hiphop as one form of music where loops and sampling are part of the sound. It pretty much grew out of sampling from vinyl and using tape loops anyway. Just dragging and dropping premade loops into the timeline always seems lame and boring, but if you create your own loops, i guess that seems more creative.
Slicing and rearranging existing loops to create new drum patterns and variation is one way to do this, you can do it manually in any audio editor, but some DAWs have tools that make the process easier, such as Slicex in FLstudio, which will also export the slices as midi events and you can construct new loops using a midi score, much like all the drum software people are using to fake their drum tracks. Not sure of the source of your loops, but slicing beats sampled from recorded songs can be a lot of mucking around, and slice points can be hard to find, but on the upside you'll probably learn a lot about midi programming and generally using your DAW for audio editing in the process. I've spent countless hours myself mucking around with beatslicing, but more in the context of breakbeats and electronic music.
Working from scratch is probably simpler in a lot of ways, packages like the Native Instruments and a lot of the stock VST's in some DAWs have a lot to work with. Sequencing drum machine emulation VSTs and samplers/romplers is pretty straightforward using a midi score or step sequencer, and once you have the drum sounds you want, writing a convincing basic hip hop beat is something that easily could be done in 6-12 minutes, if that's what the tutorials you've seen are implying. Add a few VST synths for bass, some melody and embellishments and you've got a track ready for a vocal, turntables,more samples, whatever. Not trying to say that hip hop is simplistic, i just don't think there is really any mystical process involved in making most music, except for maybe the initial inspiration, and often the simple ideas turn out to be the best. All just a few approaches i took working with similar stuff, I don't claim to be a producer. Don't know much about hip hop past about 1990. Good luck!
