Bear in mind, that if you become a LL, in order to market effectively to sell and to exchange, you need vacant possession.
Getting vacant possession can take over a year. Firstly, you cannot give notice until certain points in the contract. Then you need to give at least 2 full rental months if notice, even if tenants are beyond he fixed term, and if on a fixed term, won’t be able to give notice for before the end of that. Tenants do not have to move out at that point and are entitled to a legal eviction process which can take months. Your property becomes their home and legally they have lots of rights. People often think letting is a quick buck and don’t realise the implications, rights of tenants and responsibilities of LLs in rerun for rent.
So, if you’re wanting to sell relatively quickly bear this in mind. There’s no quick sale with tenants in situ. Therefore letting a property needs to be at least a medium term thing.
Don’t think of selling as something you can’t afford to do and think the default is letting it out. Know that letting it out could involve significant costs to you - you cannot delay any maintenance that needs doing when you have a paying tenant, plus if you have a void or a tenant who doesn’t pay, you’ll still have to pay your mortgage. With the latter you won’t be in a position to sell and there can be damage.
I’d only advise doing it if you will do it for several years and after joining the NRLA and going in a course about LLing so you can make an informed decision. Lots of LLs get burned through starting to let without enough knowledge and of course, their ineptitude has serious consequences for their tenants too.