On: Mozilla Servo alpha will be released in June

[bitdivision]

You can filter the issues by E-Easy labels [1]. As far as I know, these issues are generally intended for people who haven't contributed before.

Additionally, the rust / servo community is very good, so you can usually get help pretty quickly on IRC.

[1]: https://github.com/servo/servo/issues?q=is%3Aopen+is%3Aissue...