Not a fan of LLC's for that. We had an LLC but it was more hassle and expense than it was worth--business insurance is much more expensive than landlord insurance that you can get as individuals, the tax returns were more complicated and thus for us at least had to be done by an accountant... total PITA.
For collecting the rent, I encourage tenants to set up an automatic payment where their bank mails me a check. For the ones who haven't done that, it varies. I have some tenants who are students near where I work so we just meet in person monthly and they give me the check. For other tenants, they just mail it.
For insurance, that is very state dependent so you just have to shop around. Start with whoever is your current insurer and tell them what you need (landlord insurance, liability coverage of $X, replacement cost or whatever for the house, deductible of $Y). Then call around and get quotes from other insurers.
For screening, I've used YouCheckCredit.com. Easy and good.