It all depends on you. You can get as many clients as you want. BUT you have to work for them.
Honestly, coming and asking if you made a mistake on purchasing to much; shows you may have made a mistake. Shows your plan is missing if after spending that much money you are wondering if you can get enough clients to even pay for just half your equipment this year.
You my friend may have just purchased yourself an expensive hobby.
Can you succeed, yes. BUT with $11000 dollars worth of equipment you need to get more than 17 clients. You could have spent $5000 dollars and got enough equipment to do 30 lawns.
Good luck. I have spoken truthfully and harshly, but I wish you the best.