You can check out a web designers portfolios and see if what they offer is to the standard you require. The big mistake a lot of people make is look at portfolios and look to see if they like any of the sites visually (like checking out curtains and wallpaper) and turn them down if they don't see one they like that is suited for their business.
Instead, look at whether the website design is suited to the business it has been designed for and are they generally at a good level of design. All websites should be custom designed to suit a business, when paying for a custom design that is. If you are using such as 1&1, then you are using templates which means others are using the same design.
If you want to build a brand, having your own custom logo and other marketing materials like a website, leaflet, business card, van signage, etc, is so important to get over to your target market (your potential customers) that you have invested in your business because you believe it is worth it. Don't overdo it. Just do enough to make a good start and get going. Lots of companies improve their brand, or even do a total re-brand, once they have had time to get a feel for what works, what doesn't what feedback they have had, etc.
Also consider what is included in the cost you have been quoted.
So for example with a logo design, how many initial concepts, how many times can you revise it until it's exactly as you want it, will it be provided in all file formats including vector artwork for print, will you be provided with the fonts and colours in case you need to use them elsewhere, e.g. on the website or on a leaflet, and most importantly....will you be given copyright to the logo design! This is not automatic as you might think....the author always has copyright by default. You have to make sure it is included in your purchase price.
Next, with a website, does it include a content management system (CMS) that is an open source one and not one they own (a dire route to take for various reasons), does it use search engine friendly software and will it be optimised with your keywords in the meta tags, etc, will they ensure that it is fully working before handing over to you, will they give you training on how to use the CMS, what aftercare is there, can they email or call you for general support when you get stuck, do they reply the same day every time you contact the (what is their guaranteed response rate), do they provide website hosting or do you have to sort that out yourself and buy your own at an extra cost. So much to consider when comparing. Customer service an aftercare is paramount once the site is built and live.
I run my own web design business as my main day job and Spotty Frogs is a new soft play hire business which my family will be running, whilst I take care of design, marketing, hosting, seo, etc, so I do see things from both sides of the coin. it's a continual exercise of checking, tweaking, changing, improving, deleting.
Your marketing materials should always be "ongoing" with regards to continually updating them, but your brand should be strong so you can anchor it down and establish it in order to grow and even gain a value as a business. Your brand becomes intellectual property which in itself can have a value as an asset to the business.