Actually, you need not apologize about your english, as it is better than that of many natives.
Owning 6 blogs, with 4 of them updated more or less regularly, I feel your pain. However, always remember to keep the main thing the main thing. In the case of blogging, content is king. If I have a choice between adding content or "optomizing", content has to win.
As far as research, you need to be careful about overcomplicating these things. While there is a learning curve, the various blogging platforms make the main things, such as posting and images quite simple. My strategy has been to get the blog up with a default theme, start posting and then, as time permits, do things like theme changes, add pages, about me, and cetera.
That is not to say that it is not work, it is, but if you had a lemonade stand, the main thing is putting lemonade for sale, not researching new recipies, not tweaking your sign, not joining the chamber of commerce. All those things are important, but they pale in comparison to having a product for sale where someone can buy it.
In blogging, the main thing is getting content up on the web, so it can be seen, indexed and read.
I also find it helpful to seperate high brain functions, such as writing, and low level functions, such as url submission, comments on other blogs, and reading other blogs. The former requires more brain activity, that is, I need to be more alert. more awake. The later I can do at the end of the day when I am not so fresh.