Edit CSS in WordPress Blog Child Theme

Hello, I am looking to have three aspects of my website ([login to view URL]) modified/fixed: 1) One of my primary struggles is that my blog page ([login to view URL]) with over 200 blog articles is not formatting correctly. The page should have three columns of blog posts that scroll downwards. On my site, the first row has three blogs, then the second and third rows have two blog posts, and some other rows only have 1 blog post. This is making my blog page look scattered and unprofessional. I contacted the original theme developers and they were of little help, basically telling me to develop a child theme to fix this problem. I've researched how to develop a child theme and have actually installed one. I have modified things like border, margin, padding, width, etc. I haven't found the missing element(s) as to what's making this page put different number of blogs in each row. You can see what my blog page looks like in the attachment below. I want each row of blog posts to have three blog posts with images that are all in alignment so the page looks neat, organized, and professional. 2) I would like to have the the 'date posted', 'poster (admin)', 'category (uncategorized)', 'comment' and 'edit' icons removed from the site. These can be found on the homepage ([login to view URL]) and the blog page referenced above. Also you can see the pictures in the attached files. 3) I would like to have the "Leave a Reply" section removed from the bottom of the 'About Us', 'Guarantees and Testimonials', 'Store', and 'Contact Us' page. This section has a Name, email, website, post comment field, and a post comment button... all of which I would like removed from the bottom of the page. I could not attach another file to show the picture of the "Leave a Reply" section, but it's hard to miss if you visit the site. I can email a picture to whoever gets the job to clarify the details. *** NOTE: I would like for these changes to be implemented in a child theme. The theme gets updated from the developers somewhat frequently and I do not want these changes to be overwritten when updates occur.