ABV=Alcohol by volume, usually represented as a percentage.
Most wine is 9-14% ABV. Most hobby winemakers use a hydrometer to measure the specific gravity:
https://www.morebeer.com/products/beer-wine-hydrometer-correction-scale.html?site_id=5
They have a cheaper version for $6.99. I use the plastic tube the hydrometer comes in as a testing jar. Fill up the tube with wine must or beer wort, drop the hydrometer in and get a reading. Be careful with the hydrometer, its fragile and easy to break.
There's lots of videos on you tube about using a hydrometer, here's one:
[ame]https://www.youtube.com/watch?v=jNVePBvI2ps[/ame]
Another useful tool for pulling samples to test the gravity is a "wine thief":
https://www.morebeer.com/products/sample-taker.html
If you like sweet wines, I'd suggest you try some of the kits available.
Making fruit wines from scratch is actually a little tricky and somewhat advanced. So you may want to at least check out some kit wines
I make mostly cider and dry grape wines, but people in my local wine club make lots of sweet and semi-dry wines with kits that come out quite good.
http://www.homebrewing.org/Island-Mist-Peach-Apricot-Chardonnay_p_2462.html
Note: I've never used any of these kits myself, so use your own judgement before you buy. Also, look on Amazon, you may be able to get kits for even less.
There are also fruit wine base concentrates available that will bring your wine cost down quite a bit compared to using kits. I've never used the following product, but your wine would end up costing about $2 for a 750 ML bottle:
https://www.amazon.com/dp/B019QQ5XN2/?tag=skimlinks_replacement-20
Finally there's so much free material on you tube and various blogs and forums, but perhaps a book on fruit wine making would be something you could use:
https://www.amazon.com/dp/1905862822/?tag=skimlinks_replacement-20
Hope you have fun with your fermented creations!