Karen my dd started crawling at 5.5 mos. old so I can relate! She would not sit still and her crawl was more like a gallop. Was into everything.
At that age the best you can do is childproof. She is too young to understand not to go near stuff. That comes in a few more months but even then their impulse control is so strong they don't always leave it alone even if they know better.
For wires and stuff, see if you can hide the majority of them behind furniture. You can also get some special u-shaped nails and tack them down to the baseboards if you are unable to move that item.
We actually stripped our livingroom/bedroom bare during her early mobile months. We moved our barstools to the garage for almost a year because she was climbing on them and one fell over. We removed our coffee table because it has sharp corners, and I put all my large potted plants outside or in another room. Put baby latches on all but the cabinets I didn't mind her getting into. Even put them on some of the dresser drawers after she was trying to take the drawers out and climb them like stairs! Yikes! Emptied our bookshelves on the lower levels and put her toys there instead. Put any cleaning chemicals that were under our cabinets, as well as shampoo and things, out in the garage or behind latched doors. Put our bed on the floor, etc. etc.
Your baby will NOT be a brat if you don't set limits yet. Like I said she just won't understand, she'll just think you are hurting her and not always connect the two. The only discipline I did with my dd at that age was if she slapped me in the face I would put her down and walk away for a minute. She learned, but was necessary. Imposing too many rules will make her not so confident. Try to make it a "yes" environment.
The only time I taught my dd something was at 12 mos. we stayed with my IL's in India for 2.5 mos. They put us in a room with a large bed and marble floor. We had to keep the bed up for pest reasons, and although they provided us a crib for her she's never had one and didn't take to it at all. So for 2-3 nights if she crawled to the edge of the bed I would immediately place her back in the center. Took about 15 min. of doing that and her getting very frustrated to learn to stay away from the edge of the bed. It was a real pain to teach her and I can't imagine trying to do that for everything in the house, esp. at 7 mos. old.
The real discipline comes much later. Dr. Sear's Discipline Book is a good one! But he doesn't even talk about disciplining young babies except to teach them not to bite mom's breast. He said discipline starts at birth, and the infant period is spent building up the foundation of trust and love that will see you through the toddler years into teen years. So for now just love her and keep that bond strong.
Darshani