My advice for you:
You could get a webdesigner/Wordpress dude to set up everything, BUT it´s worth to try it on your own. There are hundreds of tutorials on youtube and you can pretty much learn everything within a few weeks.
Regarding your payments it is important to know where you´re from. For example in
Germany the method pay by bill is quite common. Actually the most used form of payment in Germany. You receive a bill with your package and can then pay within 14 days via bank transfer.
Sure other countries have other favourites. Paypal, Creditcard, Wire/Sepa, Check´s, name what you want. It is important to adapt to your key/core market. A lot of people like paypal. Personally i know from a lot of merchants about these ridiculous fee´s and several problems, but it´s up to you.
Your next steps:
1. Research: Look at your market. You customer´s and other merchants in your sector.
2. Set up a blueprint of your businessmodell and check out severall service. Maybe your local Bank can support you(?), or you might wanna look at some
EMI´s or stick with paypal.
3. You can also ask a webdesign student to help you out with your shop/website. They´ll def. help you out for a few $.
When you have some further information and maybe a short business plan you´d like to show us, we can help you out with more things.