Most ads are false inferences, half truths or worse. Solar panels and wind turbines are rarely an exception. You need a million dollar facility to make PV panels out of sand or wind turbines out of scrap metal. Unless someone owes you a favor or you are very lucky, buying components and assembling them typically costs about as much as buying a finished product/ lots more if you make some errors. In typical locations, alternative energy will cost several times as much as buying it from the utility. Exceptions are rare.
You can do alternative energy as a hobby. What you learn may help you get a better paying job.
While trees help absorb carbon dioxide, they are bad for alternative energy as they block the wind and shade the solar panels. In most locations the wind is quite weak most of the time and clouds obscure the sun ten or more hours per week. Large wind turbines typically need a permit which is likely to be refused and neighbors up to a mile away may sue you for vibrating their house, causing epileptic seizers from the flickering light etc.
So start with a small system = a 100 amphour, 12 volt deep cycle battery and a few square feet of solar panel or a tiny wind turbine You need a diode to keep the battery from powering the wind turbine when the wind stops. Many small solar panels come with the diode built in. You don't need a charge controller if you draw some power from the battery weekly or oftener. A new fully charged battery can supply up to one kw briefly, so there is little point in buying an inverter rated much more than 1000 watts, unless you expect to add more batteries soon. Several batteries of the same type in parallel are ok until one of them is bad, which may discharge the other batteries. It will take weeks to recharge your batteries with one square foot of solar panel = a tiny 15 volt dc power cube will charge them about as fast. You can connect both until your batteries all measure a bit over 13 volts. Check each battery as a low voltage while charging is usually due to a poor connection, which is a frequent problem. Neil