Can you please explain that further? I don't know where to begin with the organolithium.
Well, if you look at your starting product and at your final product, you can clearly see that you need to introdue 2 carbon atoms, one of them being a carbonyl compound.
This can be achieved by the attack of an organometallic compound to an ester or anhydride, through an addition+elimination mechanism.
Now you just need to figure out what is the carbonyl compound you need and what is the corresponding organolithium reagent required, and how would you prepare it from your starting product.
Edit: Now that I think it and see the rest of the questions, you probably did not study that reaction too.
What about alkynes? Did you study them?
Deprotonated acetylene is another good way of introducing two carbon atoms. You can reduce it to an alkene and then obtain the corresponding markovnikov alcohol.