what is vaping
It's a far less risky alternative to smoking. Some people use vaping to quit nicotine altogether, some people use it as a long-term alternative without wanting to stop and some people use it to cut down or just for situations when they can't smoke. A glycerine-based liquid, typically containing nicotine and flavourings, is heated to boiling point and the vapour is inhaled.
can you vape inside
Yes, although some places have banned it. Second hand vapour does not carry the risks of second hand smoke because there is no combustion.
what does it feel like
Kind of like smoking but kind of different. You inhale a lot slower and for longer. There can be a 'throat hit' similar to a fag, depending on what type of glycerine you are using and also, to a lesser extent, the nicotine level. I tend to inhale a lot less deeply than I did with fags, instead I kind of roll the vapour around my mouth, nose and throat. It's a much more olfactory experience than a fag, not least because of the vast range of flavours available.
can you have with a glass of wine/coffee?? as you vape
Yes! You'll probably find some vape flavour / beverage combos that work really well together. I like nut flavours with coffee. I don't drink wine but I like RY6 (hefty tobacco flavour) with a beer.
when do you vape, same as when you smoke
If I'm somewhere vaping is ok, I tend to have a couple of drags every 10 minutes or so. OTOH, if I'm somewhere I can't vape, it's easier than not being able to smoke. Also, I don't wake up gagging for a vape 
where can you buy easily
Depending on where you live, you might have a vape shop locally (it's very patchy). They're good for advice and the opportunity to try different things but can't match the internet on price. I'm in London which, for some unfathomable reason is very short on vape shops and I buy everything online. I like MyEpack for equipment and Joose Juice and Premier Ecigs for liquid.
whats the difference between vaping and ecigs
Nothing! Everything from the crappiest cig-alike bought from the 24hr garage to the giant dalek's cock type things is a vapouriser. Some people use ecig just to refer to the cig-alikes, some use it to refer to any vapouriser.