Be patient until you see what you're looking for as far as lift capacity, fuel type, total height of the forklift assembly, price, and of course, location. If you will be using your forklift in an enclosed building without fresh air coming in, you either have to go electric or get good ventilation in the shop during and for a while after use. Then a couple years ago after I'd moved up north, even the local Minnesota news told of a company in Houston, Texas where nearly every employee was taken to the hospital, overcome with exhaust fumes. That was my ex-employer. All operations were shut down pending OSHA investigation.
Propane works well inside and has very little fumes.
We have a 6,000-lb lift and it handles anything we need. If you re operating on gravel, you ll have to go with pneumatic tires. The upper end of that size range would do best while giving you the tight-quarters ability. Three stage mast and side shift are commonly demanded features and make the machine more useful. We have had good luck with machines from a reputable lift dealer that are 2 to 3 years old and have 1000 to 2000 hours on them, have been well maintained and don't look beat up.