Okay. You want to bring him home (USA) with the goal of living with you as a "fiancee" if I'm reading you correctly. You can file the applications on your own if you'd like and take your chances with the system which is a lot like taking your chances with the lottery if you're not prepared. The visa fee is just the start. He'll need a temporary resident application and an application for employment authorization. There are no guarrantees and if denied, your application fees are NOT refundable.
Check the table for filing costs, we're already up over $1,500 USD:
USCIS - Check Filing Fees
Even if you get an immigration attorney there is a chance that the process may not yield the desired result. The rule of thumb is "the better the attorney, the better the result, the higher the cost". A typical low end visa mill is going to want a $3,000 USD retainer. Then the filing fees, then they'll want more money when it's time (if the temporary resident/work visa is successful) to go for the permanent resident status in 2 years after the temporary is granted.
Over $4,500 before we even start to talk about the permanent resident application if you use even a low end attorney. A higher end attorney will want a similar retainer but they'll burn through it even faster as they provide additional services like home country records checks and prospective sources of employment and referals in te host country (US).
Having gone through the entire process, I would advise you to go with a less expensive attorney if you're sure this guy doesn't have any criminal record or debt back home. They will sort out the paperwork for you and provide you with the list of things that USCIS will require as proof so that when you're called for the biometrics and the initial interview you'll have a neat folder with all you need nicely arranged and well prepared. Then it's up to the two of you. The interviewers have seen it all and they are allowed a range of pointed questions designed to expose fraud, abuse or insincerity. The thing that you have in your favor is that they don't have a lot of time to spend on each case so if you walk in well prepared it will work in your favor.
One of the biggest hurdles is the fact that you'll be required to prove the ability to support both yourself and your spouse....for the next 10 years.