I think that you have to be a registered used for a while before it will let you post pictures or HTML links. That prevents spammers from creating an account just for the purpose of spam
When asking about what bike to get there is a sub-forum specifically for that: "What Bike Do I Get?" That is the better place to ask about specific bikes or get advice on what might be good for you.
As for an older bike: They can still have a lot of life left in them. Check it over, see how much of it has been "jury rigged" or otherwise repaired improperly. Cheap fixes will often cause bigger problems. Missing parts can be a major problem, especially if you are not sure of what exactly is missing. Without knowing the specifics of the bike I can't tell you if it is a deal or not, but in general I would recommend paying another hundred or two to get a bike that is complete and runs.
Bikes up to around 20 years old can still be viable bikes and parts are reasonably easily available. I own a 1986 Yamaha YZ-125 and I can still buy factory OEM parts for most of the common repair items.
As for fuel consumption, so little it is negligable for most purposes. You will burn 10 times the gas in your truck getting to the riding area than you will in the bike. For me, a 5 gallon can will last longer than I will.......
Rod