Have a good motive and even better motivation.
My advice is to start doing it and see where it goes. The toughest thing to do is to get into a habit of posting regularly enough to keep people interested. Don't be discouraged if it doesn't take off right away. Be professional: pay attention to spelling and punctuation, cite your sources and be sure you have your facts straight.
Be committed to blog everyday, be patient, have fun.
My first suggestion would be to spend some time thinking about what you want your blog to be, and what you want it to achieve. Are you making it for your friends and family to read, is it work related, do you want to make money with it or not, what types of things do you want to have on your blog and how will you organize it. Forget the technology part of it at first and just focus on what you to achieve with your blog. I would start by brainstorming on paper actually, and letting all your ideas out, because by doing that you start to see how everything fits together well, and that will save you a lot of time later.
That really depends on what your goals are for the blog. If it's a personal blog, then just be careful about posting anything that could identify you or the people you know because it could come back to bite you.
If you want to blog about a hobby or interest, either for fun or to build your personal brand, try to find your own niche or offer a fresh perspective. Also, have a look at what other bloggers in your area are doing. Leave meaningful comments on their blogs. Even though there can be an element of competition among bloggers, you're also part of a community and there is mutual benefit in embracing that.
If you want to make money from blogging, that's also possible, but it's not a get-rich-quick solution. Professional bloggers -- the ones who actually make a living from their blogs -- don't just post a lot of content with ads next to them. They sell eBooks and other products and services that people want. Blogging, like other social media, helps to attract potential customers to the website and gets them interested in what's being sold. That's not to say you shouldn't have valuable content on your blog, because you should, but it's part of a marketing campaign to support an actual business that needs to be built and nurtured.
To be an original, not copycat, be yourself, and add comments to be continuous
I think blogs should be focused on specific issues and these should be of great interest to the blogger.
My advice is split the path, decide whether you are 'journaling' to entertain your thought, family and friends, and make a statement. IF you are blogging for business, industry or money walk that path. Each path has it's own agenda and top level gurus. Search for keywords in these matters, find the guru's blogging and follow them on facebook, twitter and badger them with questions.
be yourself and don't try to copy other sites
Do it!If you have your mind set to do it, then go ahead. Make it your own, and soon enough you will have followers lining up.
First: Word Press is your friend. Make your life easy and choose it as your platform.
Second: Puh-lease use spell check.
Third: Have fun and be creative. Pick someone with whom you have a great relationship (someone who never judges you, but always supports you), and write the blog in a voice as if you are writing to them as an individual - this will make it authentic and consistent.
If you're thinking about starting your own blog, i say.. DO IT!
There's nothing to lose and in fact a lot to gain, you can meet some great people through blogging and it can become a really fun thing to do and great hobby, you have to think of what you want your blog to be about (cooking,fashion,beauty ect) or many even abit of everything and then get posting and msot importantly ENJOY EVERY SECOND! :)
If you want to start a blog, know and be true to your topic, expect to work hard and keep long hours. As a professional blogger you need to have a grasp of graphic design, understand the principles of marketing, and know basic web design and html.
DO NOT TURN YOUR BACK DURING THE FIRST YEAR!
If there is one thing that I could share with another blogger is this - find your passion in life. Find your passion and the money will come to you.
Another tip I would love to share - Never Ever Give Up No Matter What. If you feel like that you are not succeeding, give it one more minute, then one more hour, then one more day and before you know it you have a blog that is successful and that others love reading. Connect, Stay, Keep Going, Dream, Believe, Achieve, Success. Its that simple!