editing

I have several paragraphs written and now in the process of editing it. I hate this, it is long and tedius and not anywhere near as fun ad writing. But it is necessary so im doing it. But it is tedious. Carefully and slowly reading what I wrote line from line, reading it not for fun. Reading it with a critical eye looking for screw ups, misused words. Looking for sentences that seemed ok when I was writing, but makes no sense or difficult to comprehend when rereading it a second time.
Lots of those :(
lookng for sentences that start with And or But,. Looking for sentences that need separated iinto two or more. Or sentences that need combined into one. Or things that can go away because they restate what was already said previously.
I am asking for advice, what do I look for and how can I tell if a sentence need divided, or combined. What other misused words or phrases should I look for when editing
I need editing advice.