Hi Maria,
Not to worry, it can be overwhelming when you have everything to do 'all at once' but you've got all the resources you need right here
For press releases - check here in our industry directory
http://www.virtualassistantforums.co...ss_Submission/
for numerous sites you can submit your press release to for free. You'll just need to create accounts at each site you wish to use for submissions. (Also if you go back through and read old threads in this section [marketing] you'll find some discussions about press release sites, which are best/preferred, etc.)
As to newsletters - I, and my clients, always ALWAYS write our own original content. I cannot stress enough how important it is that the majority of your website, newsletter, marketing material - whatever it is, be your words, your philosophy, your writing.
It's definitely OK to reference other articles, quote or paraphrase them, even print them or link to them if allowed by the original author but my own suggestion is that the bigger percentage of your newsletter should be your own content or content authored by someone specifically for you.
I hope the info helps!