The customer is going to want to know a few things before you get started with your sales presentation. First of all, they are going to want to know why they are here. Even though you might have told them before hand, they will still probably want to know, and they have a right to know. After all, you're on their time and you know that time is money.
Next the customer is going to want to know what you're selling. Make sure that you communicate this to them in a precise manner, and make sure that you state it in a way that is beneficial to their company. Then of course, the next thing they will want to know is how long they are going to be there. This in mind, you can start your presentation with something like this:
''Hello my name is Gary. I will be giving a presentation today on the De-Ruster 5000 which can help your customers get rid of rust ten times faster than the leading product on the market. This presentation won't take long, perhaps thirty minutes, and when it's all over you will have the specifics on a product that can shoot you to the top of the market in no time!''
What you've just done is present a product that the customer or company can use to their advantage. You have their attention now, because any smart company is going to listen to a sales pitch that involves their company making more money.
Most importantly, you need to make the customer believe that you are more than happy to be there; that you enjoy talking with them and spending time in their facility. If you look like you are bored, then the company will not have any faith in you at all. After all, why would they want to buy from someone that doesn't like them?
If you feel that you are losing the attention of those attending the meeting, then you need to reinforce your presence by thanking them for their time and reassuring you that they'll be out of there soon. One example might be ''I know everyone's getting tired of hearing my voice, so I'll make this fast''. Even if you don't intend to make it fast, they'll then start to pay more attention.
Sales careers can be very difficult. If you can get the hang of it however, it can also be extremely rewarding! If you think you might be good at jobs in sales then go for it, but know that it's not going to be incredibly easy to get started. There will no doubt be a lot of complications at the beginning of sales careers. Keep moving forward in your sales jobs, and make the field your own. Pretty soon you'll be on your way to a steady income and a comfortable lifestyle.