Do it yourself

Hello! I am new to this group and new to home repair, so if any question that I ask seem really silly, just bear with me.I have decided instead of having someone come and do any repairs on my home that I can do it myself. (Once someone tells me how! LOL!) I need to start with the bathroom and I need to know how to repair cracks and nail hole in sheetrock? What do I use and what are the best brands etc?? Also when I do repair these cracks, how do I go about getting the texture back in those spots? My house was built in the 60's and I've got some good size cracks of the doorways. Any help would be appreciated! Tia