Ok so then screenprinting and Embroidery is out.
If you ended up deciding to sell t-shirts and you wanted a larger quantity, screen printing wouldn't necessarily be out. Screen printing is good for larger quantities (usually 24+) of the same design.
Also I would go with those services however, they seem pricey?
The key with those services is that you don't have to pay anything until you sell a design. For example, with cafepress you can upload your design and put it on a product so that it shows up in your store (that they create for you).
You don't pay anything, however they set a base price for the product and you can set your markup above that price. So if their "base price" is $12 for a t-shirt, then you can price it in your store at $18 and you don't have to pay anything.
When someone orders a t-shirt from your store, cafepress prints it on demand and sends you the difference between their baseprice and your marked up price.
So the $12 baseprice (for example) covers the garment, the printing, the hosting of the store, the ecommerce processing, customer service, etc.
So once I get to 15 posts I can ask people here to make me these t-shirts?
Yes, once you reach 15 posts, you will be allowed access to post a service request in the T-ShirtForums Classifieds area.
So if you wanted to see if a forum member could print the 10 t-shirts for you, you would put all the specifications of what work you needed done (how many shirts, what color, what sizes, sample artwork to be printed, print locations, how to contact you, etc) in a "Service Request" post in the classifieds and members from the forum who are interested in doing the work will respond to you via PM or whichever method you specify in your post.
I am still confused on how I should go about getting these shirts made profesionally and cheap.
Getting 10 t-shirts made professionally AND cheap may be a challenge. I'm sure it can be done, but generally you get better pricing when you do larger runs of t-shirts.
plan on getting in the business, but I do not want to invest in expensive equipment just yet, I know someone who bought the iron on transfers and did it himself, is this profesional looking and longlasting?
If you aren't interested in getting the equipment yet, then your options probably are to use a print on demand service like the ones I listed above or to find a company to print them for you using plastisol transfers.
"iron on transfers" have come a long way

They aren't "ironed on" anymore (for professional results). When done right, they are printed with special inks on quality transfer paper and put on with a professional grade heat press.
You can learn about a lot of this stuff by reading some of the forum threads in the various heat press and screen printing forums.