1. You need to do your own market research . Look at similar listings in your area for rates . Look at Airdna for likely supply and demand for similar properties
2. no one can tell you your likely gross and net profit it's up to you to estimate this by putting together a profit abd loss budget with all your likely to set up and ongoing costs and a projection of likely income
3 there's no one size fits all when it comes to the cost of letting out your home . It could be £1000, £10.000, &100,000 it obviously depends on how much work needs doing, what your are going to spend on decoration and kitting out your home eyc
4 . you can check with your local government about STR legislation
5 ask on your local host group for recommendations for local cohosts what they charge depends on what services you need from them ask them
this is a business and you need to treat it as such by carrying out proper market research
many areas are oversaturated with falling demand and/or have STR restrictions @Neal141