Excellent. You can never have enough guitarists in the world
Lessons would be great to get you started with chord shapes and basic scales (major, minor, pentatonic etc.) .
Your dexterity will be rubbish at first, unless you are naturally dextrous, but that will pick up as you keep playing. Just keep at it.
Get some tabs of some simple songs from the web.
http://www.power-tab.net/ This little piece of software is very useful to view and edit tabs. I find Guitar Pro easier to use and has much more functionality, however it costs.
As for buying a guitar. Go to your music store and try out guitars. Focus on the way they feel. Ask a member of staff to help you out. I would recommend the Yamaha Pacifica as a starter. Squier Strats are a bit hit and miss from my experience. And a poorly made/setup guitar can be a nightmare to play on and will set you back. When you do buy your guitar ask the guitar tech at the shop to do a full set up for you. It will cost you a bit extra but will make playing that guitar a lot easier since a lot of guitars come from the factory poorly set up.
As for an amp a cheap one will do for the first couple of months to get you started. Then you might want to invest in something a little better. A lot of shops sell Roland Cube amps with varying power. These amps are fantastic value and sound great.
Also, a useful bit of advice is to learn the technical aspects of the guitar itself. (String gauges/tension, how to set up a guitar, intonation, truss rod adjustment, spring tension for tremolo equipped guitars, action height, electronics). All of these will help you understand your guitar much better and make your playing experience much smoother. Plus it saves you money from taking it to a shop.
Learn how to change strings properly. When I worked at my local music store there were a lot of beginners paying me to change strings for them costing them £10 + cost of the strings.
Good luck and enjoy your journey.
