Rash/Scrape Prevention for Beginner?

Hi guys! So I'm a brand spankin new beginner surfer. I haven't taken any lessons but a few friends rented some surfboards and they showed me some basics. I'm going to take an actual lesson in a few weeks.
So far, I haven't quite gotten the whole "popping up" thing and end up relying on my knees a lot. Even when I feel like I didn't go to my knees, I think I scrape my knees on my way to getting on my feet. The time I went surfing I ended up with a pretty nasty scrape at the end of the day on my right knee. It took forever to heal and even got infected and needed to get antibiotics for it.
I understand the scrapes and bruises come with the territory and my knees should fare better once I get better at surfing properly, but while I'm still learning and figuring everything out does anyone have any suggestions for ways I can prevent my knees from getting all banged up?
I also got an annoying rash on my rib area so I was thinking of getting one of those rash guard tops for that. Does it make a difference compared to if I just wore a tshirt?
I'm in south florida and the water is pretty warm so I don't want to get a wetsuit or anything (also, I hear wet suits are expensive and so I don't spend the money). But does anyone have any suggestions for something I can use for my knees? I figure a big bandaid will just rub off.
Thanks!
So far, I haven't quite gotten the whole "popping up" thing and end up relying on my knees a lot. Even when I feel like I didn't go to my knees, I think I scrape my knees on my way to getting on my feet. The time I went surfing I ended up with a pretty nasty scrape at the end of the day on my right knee. It took forever to heal and even got infected and needed to get antibiotics for it.
I understand the scrapes and bruises come with the territory and my knees should fare better once I get better at surfing properly, but while I'm still learning and figuring everything out does anyone have any suggestions for ways I can prevent my knees from getting all banged up?
I also got an annoying rash on my rib area so I was thinking of getting one of those rash guard tops for that. Does it make a difference compared to if I just wore a tshirt?
I'm in south florida and the water is pretty warm so I don't want to get a wetsuit or anything (also, I hear wet suits are expensive and so I don't spend the money). But does anyone have any suggestions for something I can use for my knees? I figure a big bandaid will just rub off.
Thanks!