seems like u r v.confused taking it...as there is not much difference between laptop and desktop usage...i will want to first tell u abt the similarities/differences they both have...

1-In desktop we hve seperate keyboard, mouse, monitor, Cpu, speakers, webcam...BUT in Laptop we have it all together...yaani aik he mein yeh sub through company installed hota hai...

2- In desktop we hve to connect all the wires to the cpu with there respective hard ware devices. yaani monitor ki wire ka aik end cpu ko lage ga...speaker ka aik end cpu ko lage ga...mouse ka aik end cpu ko lage ga...ussi tarhan webcam ka aik end cpu ko lage ga...BUT...Laptop is free from all this...there is not connect type thing...we have all of it in one...lekin agar aap chahti ho k aap ka mouse and webcam alag ho...tau woh aap laga sakti ho...kyunki desktop ki tarhan laptop mein bhi connect karne k liye jagah bani hoti hai...

3- Desktop is used on only power(electricity) BUT in laptop we hve mobile type system..battery lagayi aur laptop mein save kia...phir without battery bhi use kar sakte hain...

4- the screen of desktop is 800X600 hota hai ...mostly...lekin laptops ka 1024X768 hota hai...screen size...(monitor's height X width)

5- we hve a seperate keyboard in desktop with many keys more similar like laptop's key and are adjusted in them...agar kabhi aap laptop dekhengi..tau zuroor us k typing area mein dekhiyega...

6- u cannot take desktop where ever u go...but u can take laptop as it uses battery

u can also get some info from Aadi's post too...
now here comes the operate thing...i mean how to use it...
when u will hve one...u will know how to operate...as they will give u a booklet in which they will tell u in detail...everything that ur notebook holds...

u will operate in laptop the same way as u will operate on desktop..as both of them use the same windows...same software...no change...no change at all in the usage...it looks different ...but it isnot...actually every thing has been managed here in an organized way...dont worry...

if u hve any question...u can ask...with the topic u want some info...so that its easy to go ahead